Saddle shaped mirrors are really weird to look in

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A saddle point is a point that is concave and convex at the same time, so what's it like to look into a mirror like that?
A huge thank you to Brian at AlphaPhoenix for the first mirror. Check out his brilliant video showing how it was made: • Two ways to make asymm... and be sure to subscribe!
And a huge thank you to Andrew Draminski and Michael Barson for the second mirror.
My video about caustics: • Caustic lenses are rea...
My video about Chinese Magic Mirrors: • Chinese Magic Mirrors ...
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25 май 2023

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Комментарии : 1,2 тыс.

@SteveMould 11 месяцев назад

A big thank you to Brian for the first mirror. Check out his channel, it's brilliant: ru-vid.com And a big thank you to Andrew Draminski and Michael Barson for their mirror too. The sponsor is Surfshark: enter promo code STEVEMOULD for an extra 3 months free at surfshark.deals/stevemould

@Manoplian 11 месяцев назад

Not a big deal, but as someone who values knowledge, you might want to know that maxima and minima are plurals, if you have a single point then that point is a maximum or minimum (or as is the case for saddles, both)

@2treeman435 11 месяцев назад

@@Manoplian I think the plural is used in reference to the fact that there are multiple maxima/minima on the curve. The point being that the saddle point is both maximum and minimum in orthogonal directions.

@ITRMUGENITR 11 месяцев назад

I am sure these guys can get the mirror for you ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jJXBBdHOOqY.html

@Manoplian 11 месяцев назад

@@2treeman435 He said "a maxima" and that's not gramatically correct regardless of context.

@Perryman1138 11 месяцев назад

Am I the only one that wants to see the mirror rotating?

@nate_0723 11 месяцев назад

I appreciate that you demonstrated that a Pringle, while saddle shaped, cannot be used as a saddle.

@CanalTremocos 11 месяцев назад

My equestrian aspirations shattered.

@DMacB42 11 месяцев назад

I guess we’ll never see usable saddles made of pressed potato sweepings. Oh well, more Pringles for me

@Skooozle 11 месяцев назад

I'm bothered by how many pringles were wasted in this video.

@thomasi.4981 11 месяцев назад

Absolutely lost my shit when he said that

@lettersnstuff 11 месяцев назад

countless lives may have been saved

@SensSword 11 месяцев назад

You could not have possibly found a worse mask to use, but it's absolutely hilarious.

@insouciantFox 11 месяцев назад

I think you mean you couldn't find a *better* one.

@Werevampiwolf 11 месяцев назад

I think Michael Myers might have been worse lol

@oldvlognewtricks 11 месяцев назад

@@insouciantFox ¿Por qué no los dos?

@WobblyBits_X 11 месяцев назад

My first thought when I saw it was that obviously it was a Reagan mask and he was making some obscure joke... Looks nothing like Arnie, lmao.

@MonkeyJedi99 11 месяцев назад

I don't know, pretty much ANY clown mask is creepier.

@Si-Al-Ti 11 месяцев назад

Crazy how Arnold Schwarzenegger sees Richard Nixon when he’s looking in the mirror 🧐

@tallguynow 11 месяцев назад

I’m 99% positive this was the old viral “say something obviously wrong to get comments” trick. And it’s working

@Si-Al-Ti 11 месяцев назад

@@tallguynow yeah I kinda felt the bait when he repeated his name so many times lol.

@amonynous9041 11 месяцев назад

@@tallguynow dammit, I knew this tactic and I still fell for it.

@tallguynow 11 месяцев назад

@@amonynous9041 I don’t mind it when the content is still good. I respect good creators who also play the game well

@echognomecal6742 9 месяцев назад

Thank goodness someone said it...& that I didn't have a mild stroke or something. Wait...9:30- I can tell it's A.S. now.

@zerid0 11 месяцев назад

I wonder what happens if you have 2 of these kind of mirrors facing each other? Like with 2 concave mirrors, they act like a lens and you can make a telescope. Maybe depending on what angle they have with each other it could yield some interesting behaviour?

@argeniside1015 11 месяцев назад

Yes please that would be awesome. Not sure how you would record it you'd be probably need to drill a small hole in the middle of one to get a good perspective

@zerid0 11 месяцев назад

@@argeniside1015 it might be simpler with a simulation.

@semegraph 11 месяцев назад

You could make one of the two saddles only half-silvered so you could see through it and record a hall of saddle mirrors.

@flameofthephoenix8395 5 месяцев назад

I'd imagine you'd just be applying different levels of stretch effect in different directions, which means two saddle shapes 90 degrees apart would in theory just yield a zoomed in image, or possibly a normal image.

@fondrive 11 месяцев назад

11/10, really made me feel like Arnold Schwarzenegger looking into a saddle-shaped mirror

@SebaBuenoHaceMusiquitaJijiji 11 месяцев назад

Soon we will be able to be Arnold too! WE ARE LIVING IN THE FUTUUREEH

@bbgun061 11 месяцев назад

What's it like to be Arnold Schwarzenegger watching this video?

@_BangDroid_ 11 месяцев назад

I felt more like Richard Nixon

@anonplayer8529 11 месяцев назад

@@_BangDroid_😂 Thank god wasn't the only one, I could see some resemblance to Arnold at the last minutes of the video when squinting and repeating a mantra "Schwarzenegger, Shwar...". Most of the time I was mumbling in my mind "...that is Richard Nixon..." 😵😵

@echelonrank3927 11 месяцев назад

@@_BangDroid_ HA HAAAaa 🤣 nixon CONFIRMED !

@LIES666 11 месяцев назад

It bothers me that the digital version of the mirror didn't come with a digital version of Arnold Schwarzenegger.

@benrex7775 11 месяцев назад

The bad mask version of Arnold Schwarzenegger.

@backwashjoe7864 11 месяцев назад

That omission reflects poorly on the channel, for sure.

@Chris.Davies 11 месяцев назад

The thing I find fascinating about tiny flat-surfaced hand-held makeup mirrors is that they make your face look thinner than it truly is. It took me a while to figure out how that works: it's just parallax plus the small size of the mirror.

@_KingRaz 11 месяцев назад

I love the shout out to AlphaPhoenix! I've been a fan of him for like 5 years now, super underrated science youtuber. One of those channels that even if I think I won't like the video because I don't care about the topic, I watch anyway and I always am happy I did.

@aerocookie2655 11 месяцев назад

Okay, being honest, the laser and fog are making such an intuitive 3-dimensional view of what is going on and I love that! 2D is harder to grasp and conceptualise, but this? That's really good

@johnsk16 11 месяцев назад

Agreed. The laser made everything click much easier to grog. While also looking cool!

@ittixen 11 месяцев назад

I remember this being used to illustrate other concepts before and having the same intuitive impact. Looks like laser-and-fog is a fantastic tool for explaining geometry, especially for higher dimensions.

@AminShahsavar 11 месяцев назад

Would love to see more videos of this (laser + fog + bent mirrors) if someone has links to share.

@tobyhall8048 11 месяцев назад

@@ittixen cloud chambers helped lots in early nuclear physics.

@firemarshal1bill 11 месяцев назад

The Ken doll riding the Pringle saddle is way more funny than it has any right to be

@JordanSugarman 11 месяцев назад

But only in a mathematical sense.

@youdontknowme5969 11 месяцев назад

Yee haw! 🤠 Ride it, big boy!

@redlok3455 11 месяцев назад

That must've saddled down humanities' hardest physics debate for centuries

@General12th 11 месяцев назад

Ken rode that Pringle saddle way harder than he ever rode Barbie YEEHAW

@jme2006 11 месяцев назад

I don't see it anywhere. Timestamp?

@metacob 11 месяцев назад

The rotation reminds me of how they used to rotate images quickly in computer graphics: use a shear transform (like turning a square into a rhombus) on the x axis, followed by a shear transform on the y axis, and then the result is a rotation around the center. Back then this could be implemented a lot more efficiently because instead of multiplying lots of points with a matrix using floating point arithmetic you could just shift rows of pixels a few times.

@Kram1032 11 месяцев назад

there is actually a pretty common type of ornamental mirror where you can do something similar: a helical mirror! - There are lots of helical reflective garden ornaments. They also have the turn-picture-sideways property.

@smokeyvw 11 месяцев назад

i was just going to mention helical mirrors! what's really cool is that you rotate the helix by 45 degrees, so that your reflection looks right side up - NOW: if you wave your right hand, the image waves its right hand too (unlike ordinary flat mirrors). so you can use it see yourself as others see you.

@05degrees 11 месяцев назад

Wow

@tobysimmonds487 11 месяцев назад

What flavour was the Pringle used? My guess is cheese and onion

@SteveMould 11 месяцев назад

It was! Damn, that's some good Pringle knowledge

@embolysm 11 месяцев назад

@@SteveMould it looked like there were cheese+onion particles on your fingers

@vigilantcosmicpenguin8721 11 месяцев назад

geoguessr but instead of places it's pringles flavors

@tobysimmonds487 11 месяцев назад

@@embolysm I agree, but I looked at the pringle itself. Cheese and onion tends to have more flavouring particles I find

@vhaossa3486 8 месяцев назад

We need toknow... FOR SCIENCE!!!

@JaySmith91 11 месяцев назад

"Maximum" and "minimum" are the singular form you should have used. "Maxima" and "Minima" are plural. I hope you liked this pedantry.

@germansnowman 11 месяцев назад

Came here to write the same comment. It’s a bit of a pet peeve.

@gidelix 11 месяцев назад

@@germansnowman Same here

@rosssharma542 11 месяцев назад

I liked this pedantry

@landsgevaer 11 месяцев назад

I could believe what I heard. Surely, he did that only to evoke comments to appease The Algorithm. Or does anyone ever really say that? Never heard it like that from anyone, let alone a "teacher"...

@AllenKnutson 11 месяцев назад

I liked this pedantry. Other peeves: cappucinos (it's cappucini), graffitis (already plural), vacuums, conundrums, mediums, tamale (it's tamal).

@WokeUpScreaming 11 месяцев назад

One of these mirrors would be great in a science museum. Mounted on a big wheel on the wall, with the focal point around eye height while standing, and you can turn the wheel to get the different distortion effects.

@KougaJ7 11 месяцев назад

Steve: "Hi there, could I please have an adjustable saddle-shaped mirror?" Everyone: "No." Brian: "Uhh... Sure!"

@Lizlodude 11 месяцев назад

I'm waiting for Thought Emporium to sputter silver coat a pringle now

@grzesiekl.8776 11 месяцев назад

I like how you use Excel as a 3d graphing calculator

@realityChemist 11 месяцев назад

Fantastic collaboration! Love to see two of my favorite RU-vidrs working together

@reatrdosbenkron6194 11 месяцев назад

Yeah. I've never expected Steve Mould to collab with Arnold Schwarzenegger.

@andreasbaus1554 11 месяцев назад

In her garden, my mother has some decorations that basically consist of shiny strips of metal that have been twisted into a helical shape, and they have that effect of turning the reflection of their surroundings sideways. It always puzzled me how that works.

@todd13movies 11 месяцев назад

The Cloudgate sculpture in Chicago, or The Bean as it’s known, is mirrored. You can walk underneath it and experience this. It’s very peculiar.

@TooShaye 11 месяцев назад

@6:32 so anxious seeing the laser hitting the camera sensor lol

@ThisSteveGuy 11 месяцев назад

Alpha Phoenix is such a good channel; it's great to see him getting more exposure.

@EpicManaphyDude 11 месяцев назад

steve + alphaphoenix collab is something I never knew I needed

@dhonors999 11 месяцев назад

In my laser physics class we talked about how sometimes laser cavities are purposefully made unstable so that you can pump them harder. It made me wonder if a saddle mirror could find some use for something like that. Cool to see someone actually make one!

@dribanlycan 11 месяцев назад

I used to play around with makeup mirrors trying to understand where the reflection flipped when i was a kid

@epicshadowkrazee 11 месяцев назад

The humor in your recent videos has brought me such immense happiness and enjoyment.. I love your content, and can't wait to see what comes next :)

@TiagoTiagoT 11 месяцев назад

Having the different types of mirrors, each with their own pros and cons, made it even more interesting than just having a perfect mirror.

@jamesnagle5221 11 месяцев назад

As someone who works in the ophthalmic optics industry, this all makes sense. It would be interesting to see the perspective of a lens lab, particularly when they have to deal with a high power mixed astigmatism (so front curve > back on one meridian and back > front 90' to that with a large difference between the two and both having a strong refractive power). It's based on transmission rather than reflection, but it should work out the same. If nothing else I can guarantee they have experience making very specific surface geometries.

@steveplummer5779 11 месяцев назад

The "parabolic hyperboloid" (saddle) is one of my favorite shapes.

@killianobrien2007 10 месяцев назад

My dad's too

@darikmatters8866 11 месяцев назад

This sounds like a collaboration project for Titans of CNC.. He has everything; 9 Axis turning and milling, EDM wire, EDM shape milling, Grind turning, multi-axis grind milling, 3D printed metal and a host of other equipment... If anyone can cut and polish a complex shape first surface mirror to micron accuracy it would be his crew

@lloydanders7190 11 месяцев назад

I was wondering why the simulation looked so familiar, and realized that it looks very similar to the reflection from the bell of a brass instrument! The “flare” of the bell vs the circumference of the bell cause a similar saddle point shape. Awesome video as always!

@jajssblue 11 месяцев назад

It would be cool to have a video covering how macro lenses work.

@TheUnluckyLee 11 месяцев назад

I would love to see someone 5-axis mill (and then sand down to a good finish) two wooden blocks that sandwich together and act as the moulds for the PETG (or similar). This way the parabaloid is almost perfect as you can bring in a 3D model for CAM. By heating up the PETG and having it compressed between the two blocks, I would think there would be little, if any, warping as seen here. Also, I said wood as I believe it would be the easiest to get the required finish after the machining, but if another material is better (possibly nylon...?), then that would work too - just something that could be machined well with a small lolipop cutter or similar. Anyway, great video Steve, and I look forward to your next ones!

@seth094978 11 месяцев назад

Honestly as a machinist this feels like a three-axis thing to me. The curvatures and slopes are not that great, so I'd just do a bajillion passes with a ball endmill, probably from at least two directions.

@TheUnluckyLee 11 месяцев назад

@@seth094978 I was thinking that also, but I feel 5-axis would just help that bit extra for surface finish. But I’m not stopping doing it in 3-axis though, and have a billion G02s haha…

@seth094978 11 месяцев назад

@@TheUnluckyLee ha ha. I remember the fist time I wrote a G18 G02. It was kind of terrifying to see the Z axis move like that. Also, I would probably use aluminum because it's so easy to polish and cut, and way more consistent than wood. 1145 steel would work easily too, and paper-filled phenolic resin would be great if heat transfer needed to be lower. I used to get like 32 microinch finishes on phenolic using a f#$%ing table saw.

@dclqworm 11 месяцев назад

I just love how you'll provide several ways to conceptualise a thing, if i dont understand one diagram ill understand another

@DoctorShaunB 11 месяцев назад

Suggested alternative method of creating a smooth hyperbolic paraboloid mirror: 3D print polycarbonate hyperbolic paraboloid with a high resolution 3D printer, then use a vapor treatment method for polishing to an optical grade surface, then vacuum metalization process with silver or aluminum (silver offers a better reflectivity, but aluminum is generally more available at a production level while being less expensive and still offering a high quality mirror with slightly less reflectivity). There are dozens of viable ways to make this shape mirror, but in terms of material holding shape/cost/ability to make multiple iterations (can program and 3D print many different focal points/curve eccentricities)/ability to achieve the desired shape without "wobbly bits", this method offers many advantages.

@batlin 11 месяцев назад

8:59 even though the result is heavily distorted, the idea of a mirror flipping an image horizontally (well... unflipping...) is pretty damn cool.

@Mike__B 11 месяцев назад

Here's a question, can you make a saddle shaped lens that does something similar? Or will you just get a blurry image all throughout?

@agate_jcg 11 месяцев назад

A thin saddle shaped lens should behave exactly the same way, but would be much more difficult to make. For one thing, you need to finish two precise surfaces rather than one; for another, since it's concave in one direction and convex in the other, it will need to be quite thick, so the "thin lens" approximation might break down.

@FlyingHosenlander 11 месяцев назад

nice idea, maybe it could work with 2 cylindrical lenses; 1 positive and 1 negative in the orthogonal direction. The problem with both lenses having to be at the same location might be avoided using a normal (2d) lens in between for re-imaging or maybe 2 lenses in a so called 4f configuration. Anyway that only requires standard lenses, no specials

@521cjb 5 месяцев назад

Maybe you could get two sheets of plastic, warp them into a saddle frame, close in the sides like an aquarium and fill it with water .

@AlexBayes 8 месяцев назад

Love the subtle humour in your videos, Steve

@martinellis38 11 месяцев назад

Thanks for another fantastic video. I have seen this effect before though. Some fun house mirrors (though not many) more than just being alternatively convex and concave along some axis, are genuinely negatively curved albeit slightly. I wonder how they get made. One thing did surprise me. In the UK Pringles chips are still saddle shaped. Here in Australia the situation is sad. Presumably due to cost cutting the chip is curved but only in one direction and definitely not a saddle. Nice to see they are making them properly somewhere

@mildsoup 11 месяцев назад

That Arnold Schwarzenegger mask looks a lot like Ronald Reagan 🧐

@resolecca 11 месяцев назад

I thought it looked like nixon 🤣🤣

@communitycollegegenius9684 11 месяцев назад

It is Ronald Reagan

@upublic 11 месяцев назад

mixing up 2 evils is easily excused

@seb1jakobabses1remix 11 месяцев назад

0:41 is top tier content

@TopatTom 5 месяцев назад

THATS MY TYPE OF RU-vidR

@RaccoonHenry 11 месяцев назад

the attention to detail is impressive! (I'm of course referring to the sponsor segment, where the phone has an Arnie wallpaper and the netflix profiles next to Steve are all Arnie characters)

@sandwich2473 11 месяцев назад

This is one of the very rare instances where I knew the answer before I clicked the video When I was young I had a plastic mirror square which was flexible I have no idea where it came from or how it got it, but it was definitely part of something larger that had since been broken and lost I ended up playing around with it a bunch which is when I figured out how it worked Thank you for the memories as well as the details explanation! There's a lot of things in here that I had no idea about as well

@PinkeySuavo 11 месяцев назад

1:37 I felt like that pringle is rotated differently and I had a brainlag

@lyn10gaming 6 месяцев назад

Same

@charliedulong4704 6 месяцев назад

Same

@d_savage9019 11 месяцев назад

In terms of making a saddle mirror non-planar 3dprinting might be the easiest way to get accurate shapes

@FriendlyCynic 11 месяцев назад

I'm here because Alpha Phoenix's Brian Haidet has some of the best explanations of high level physics in a, "explain like I'm 5 and was dropped on my head when I was 2" type of way. His explanations rival Applied Science's Ben Krasnow, and Veritasium's Derek Muller. Brian's video on CO2 lasers is 10/10. Amazing stuff.

@confusingdot 11 месяцев назад

I believe that having a non-symmetric face may provide some more insight into which sides are being twisted/flipped.

@howdy832 11 месяцев назад

I'm surprised you didn't mention chirality! A flat mirror shows the image flipped across the plane, so that front becomes back. But adding a concavity to the mirror in one direction also lets it flip the image along that plane, which flips the chirality back (the mirror z=x^2 reflects in the xy and yz planes). So, when you look at your mirror from far away, you're seeing (a distorted version of) how others see you! The combined result of two reflections is a rotation about twice the angle, so z=x^2 shows objects rotated 180° along the y-axis, and when you spin the mirror your reflection rotates twice as fast.

@gdclemo 11 месяцев назад

What about Fresnel mirrors that have normals that don't correspond to a 3d surface? You could build one where each microfacet points at 90 degrees to its position from the centre, so on the left-hand side it points upwards, at the top it points right, on the right it points downwards and at the bottom it points left and so on. I don't know what this would look like without simulating it but I think it would both scale and rotate your reflection.

@Mallchad 11 месяцев назад

I guess its possible but its just as complicated to build as what's been shown already

@jursamaj 11 месяцев назад

9:00 "…the ultimate way to make a physical saddle-shaped mirror…" There's an interesting construction method I saw for this many years ago. *Literal* construction as it turns out. Some people wanted to use this shape in building construction, because it can be extremely strong. You make a frame of 4 equal sides, but skewed like your adjustable mirror. Then you stretch thin strips of a material across it along those straight lines you mentioned early in the video, in both directions. They used a gauze or wire mesh. as the strips are much longer than wide, they deform easily. Once you have formed the basic surface this way, you coat it with something that can stick to the mesh (concrete in their case). A think layer would smooth out any issues, then you could spray on a mirror coating. Back then, they called the shape "hypar" (for hyperbolic paraboloid) but a quick google shows that has been re-approriated. Oh, for Arnold movies, Total Recall is worth it.

@burnercolt6647 11 месяцев назад

That stop after T2 just made my day, Sir. Thank you. That bit is most appreciated.

@scaredscorpion 11 месяцев назад

In theory a fairly cheap alternative to doing wire edm would be to use a hotwire to cut foam into the required shape.

@orvarl-o2554 11 месяцев назад

I would say that the truly mathematical way to make a saddle is to play with soap water. On this note: if you can make an elastic surface stiffen while in tension (drench in epoxy? ), you should be able to make a nice saddle shape.

@comet1062 11 месяцев назад

Coooool!!! (My reaction to all Steve mould videos ever). This actually reminded me of a question my friends and I came up with whilst procrastinating work. We took a Pringle, drew a triangle on it and then we’re like…what do the angles inside this triangle sum to? Because it has concave and convex axes, two angles will presumably be in spherical coordinates or hyperbolic depending on orientation.

@Arnnett 11 месяцев назад

Great video! You could also have explored similar image effects in transitioning from concave to convex with the Bean in Chicago

@quanquoctruong1276 11 месяцев назад

4:17 did he just draw a graph with Excel?

@Randm_Shit 10 месяцев назад

Yeah its optimal

@klausm5460 11 месяцев назад

The didactic quality of your videos is amazing. So many cool tricks to demonstrate physics in a comprehensible and fun way.

@koacado 11 месяцев назад

Hi Steve. An easier technque to make the mirror by hand would be using a leather hard clay slab and the wooden mats as a base. The leather hard clay will not get textured as much and when glazed and fired will have a very smooth finish. That can be easily coated in mirror surface with alpha Phoenix's machine. I'm pretty sure there will be a lot of potters in the UK glad to collab with you and make some saddle mirrors.

@noelwalterso2 11 месяцев назад

I noticed this effect once when camping at a festival. Someone had decorated their gazebo with those dangling reflective helical plastic strips that spin in the breeze. I was fascinated by the fact that the reflection was inverted left to right if you held it at the right angle. I never could figure it out. So maybe the easiest way to make these is to get a long strip of reflective plastic and twist it along its length.

@manuelpena3988 11 месяцев назад

7:51 I think that the horizontal stretching is puzzleing you because the face is horizontally fliped at the beggining but we can not see the difference due to it being symmetric. It would be interesting to do the animation with a non symmetric face, for example a pirate with an eye patch. Thanks for the video

@sonicwaveinfinitymiddwelle8555 11 месяцев назад

7:00 21st century humor scene

@Richinnameonly 11 месяцев назад

Those simulations are so cool. I'd immediately want to change the properties to try and simulate gravitational effects on light

@rosuav 11 месяцев назад

Congrats Steve, you invented a new way to create cursed images. I am impressed.

@yshwgth 11 месяцев назад

The saddlepoint is a maximUM, not maximA.

@kindlin 11 месяцев назад

@@booty_mcscooty But you can't have a A minima or A maxima, because mini/maxima are both plurals. That would be like saying "Here are a tunas and a crackers for a snack".

@jacksondeane1629 10 месяцев назад

Friend: can I borrow your homework? Me: 7:53

@CureSmileful 11 месяцев назад

I love how you use your photos on thumbnails, they are so wholesome

@lollolgameslp 11 месяцев назад

Here from AlphaPhoenix. Nice collab u did there and good visualizations for ur explanations. :)

@NicolasGarciaLieberman 11 месяцев назад

2:50 "science diagrams that look like shitposts"

@P01ym4rk0 8 месяцев назад

2:58 agreed

@korg47237 11 месяцев назад

7:06 Just your average Oblivion NPC texture

@skydivertyler 10 месяцев назад

Draminski is a cool guy!! He’s super passionate about this shape. Awesome to see his work finally on the channel!

@fiskurtjorn7530 11 месяцев назад

5:55 Ever so often I drive by an art object. A kind of mirror with a 90-degree rotated reflection. As I also need to attend to traffic I never had time t look at it more than a glance. I tried to find it a few times on Google but not knowing the name of the object I could find nothing. Now I recognize the shape is much like your mirror. Thank you for solving a long-lasting mystery.

@fiskurtjorn7530 9 месяцев назад

Tried it in Blender. The physics there are awesome. A plane turned into a saddle-mirror also reflects at 90 degrees.

@arkzok 5 месяцев назад

1:07 i want pringl(

@pianissimo5951 10 месяцев назад

1:13 HEY!? I was gonna eat that!!! y u drawin' on my pringle?

@TopatTom 5 месяцев назад

Nooo 😭

@jimspinner9030 11 месяцев назад

Hi Steve a good but expensive source of saddle shaped mirrors is the bell of brass instruments (even better if they’re silver plated). I noticed many years ago that if you look at your reflection you don’t seem ‘reflected’ horizontally like you do in plane mirrors.

@electronash 11 месяцев назад

0:46 Ahh, yes, it's the famous Richard Nixon / Gary Busey version of Arnold Schwarzenegger. lol

@Kelsteev 11 месяцев назад

Never, in a thousand years, would I have guessed that that was a mask of Schwarzenegger.

@elishahodgson1635 11 месяцев назад

I litterally have an exam on exactly these types of points on curves in maths tomorrow morning (yes, 8am on a Saturday, french engineering is messed up). Thanks for reminding me to go revise! ;)

@davecool42 11 месяцев назад

4:10 When you said z=x*y boy did I think you were going to show video of Graphing Calculator.

@santiagoblandon3022 11 месяцев назад

Isn't that similar to astigmatism? Have you looked into Zernike polynomials and optical aberrations? I think it would be a good follow up topic to this

@axelprino 11 месяцев назад

I have astigmatism and that didn't look at all like it

@santiagoblandon3022 11 месяцев назад

@@axelprino The wavefront of astigmatism is a hyperbolic paraboloid. Did you see how the image would slant like turning a square into a parallelogram? That's part of what a cylindrical lens (to correct astigmatism) does when you give it an angle. Also, one meridian has more dioptric power than the other, making some light converge at let's say the retina, and other portion before the retina if it is myopic ot behind the retina if it is hyperopic astigmatism. That's that causes the blurrynes of astigmatism. And also the squeezing in one direction and stretching in the orthogonal direction to the previous. I used to have natural astigmatism, then laser refractive surgery (worst mistake of my life) and now I have even more astigmatism and a bunch of higher order aberrations that can't be corrected with glasses or soft contacts.

@Purplesquigglystripe 11 месяцев назад

The computer simulation feels like it could be a fun screensaver

@seanc6128 11 месяцев назад

Nice corsi cube/fan filter setup

@MartinTedder 11 месяцев назад

It feels you could be able to answer a question I've posted to many of my artist)engeneer friends: what do you see standing in a mirror sphere? The best answer so far has been "a magnification of your eye", but i still can't imagine it.

@EmberLung 11 месяцев назад

So, what you'd see changes depending on a fair few different variables, such as the material of the sphere, the light source, and your position in the sphere. What you would generally see is the emanation of the light source in combination with the distortions of your physical appearance. Think of a true 360 degree funhouse mirror bouncing the light/images around to create a sort of fractalized droste effect which is smeared over every curvature (which are effectively infinite because any new line can be drawn between two coordinates with infintessimally smaller ratios of difference). It would basically be a big mess of you + shine, with the reflections becoming less distorted the closer they are to you/object. So your shoes, for instance, would appear more distinct directly underneath where you're standing, before fractalizing outwards away from the object/observer.

@MartinTedder 11 месяцев назад

@@EmberLung we realized that the light source would be a big issue, and also the position. I'd love to see it though. I've tried to come up with a way to build a sphere, but I definitely don't have the space.

@Deus_Almighty 11 месяцев назад

There is a Vsauce video from 9 years ago "inside a spherical mirror"

@MartinTedder 11 месяцев назад

@@Deus_Almighty I've seen it, it seems obvious something interesting will happen, but i find it hard visualizing it

@mastershooter64 11 месяцев назад

@@MartinTedder I'm sure you can make it in a rendering engine

@devinosland359 7 месяцев назад

Is that... Spoontrioc?

@Giraffemini 11 месяцев назад

Great example where the principal should be straight forward but the actual physical experience is so wierd that ones own brain becomes the enemy in understanding xD. Wonderful video! Thank you!

@dbseamz 11 месяцев назад

I know a trumpet player who saw this video and said the distorted reflections looked really familiar. His trumpet is silver plated, so he can see his own reflection in the back of the "bell" (the wide end) while playing. Being a tube, the trumpet is a convex mirror, but as it flares out at the bell end it concaves in the opposite direction.

@abellematheux7632 11 месяцев назад

9:29 must use to be out of context

@gergelyszabo4802 11 месяцев назад

It's quite interesting that 5 minutes after the release of this video, Numberphile released a video about parabolic mirrors: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oSXVmuNIfRI.html

@hugoiwata 11 месяцев назад

It is because today (May 26th) is Mirror Day in Canada

@shobhitkaul8076 11 месяцев назад

Wow. That focal point twist got me! And lazer light demo was the cherry on top

@zacplunkett8490 11 месяцев назад

Another great video, Steve. Love your work.

@jurajvariny6034 11 месяцев назад

This is in fact trivial to make, use reflective mylar foil and stretch it to square frame. The more rickety frame is used, the easier it will deform into saddle shaped mirror.

@kevin-bf4ww 11 месяцев назад

i don't think that mask is arnold my dude

@ailaG 11 месяцев назад

After he ate a Pringle he's allergic to perhaps

@matthewsheeran 11 месяцев назад

Just what I needed: another fascinating Steve "stone-eyed" Mould video since he always looks like everybody else does after they've passed you a joint!

@SR-gz6fx 11 месяцев назад

I have wondered for soooo long why only some reflections flip, thanks for quenching my brain thirst!

@MrDowntemp0 11 месяцев назад

Isn't that Nixon?

@resolecca 11 месяцев назад

I think so

@ailaG 11 месяцев назад

Arniex

@pinkunicorns3185 11 месяцев назад

1:32 you are constantly saying maxima and minima while referring to a single point. Am I wrong or should it be maximum and minimum? I see this happening at my university a lot, too, is this just the classic epidemic of errors that becomes the standard because everybody adopts the error?