Handmade holograms are really weird 

ah

whats it like just experimenting and having fun for a living and having a loving family?

Nice deceptive thumbnail

to i? did you mean do i it appears to be fixed now.

I couldn't find the links in the description 😕

yea that worked surprisingly well

The fact it was done by hand is just mindblowing

Which opaque square?

@@Flopsaurus the one with the S behind it

If all the objects are made by scratches, how does one object hide another one?

lol sameeeee

😂😂😂 Yes! That was a funny moment

He forgot to change his Minecraft skin

I developped VR app for training crossed eyes for myself

Never thought to ask ur mom?

Deep cut memory. Love solving those deep seeded mysteries. We need a word for nostalgic mystery solutions.

Laser etched holograms are not colorful on pupose. They use two physical effects: light interference and fine grating diffraction. The point is to etch a reflective (or absorbitive) surface with points that will interfere in our eyes so each eye sees the same image, but "dislocated" by the 4cm each of our eyes are separated.

He's doing God's work!

OMG I'm not the only one that used this trick to slove the 'find the difference'. It really messes with people who don't know how you did it :)

It's really extremely effective for that. I also used it a while back to find differences between a bunch of text in Word documents, but my head did hurt for a while after that

I never thought about using them in those challenges. Thanks!

I put a stereogram on the back of one of my books I publishes. I doubt that anyone else even figured it out, let alone appreciated it, but I love it.

@@thewiseturtle I'm sure someone like vsauce down the line will eventually find what you did and be like "this person was cool"

Same, I think I read about it in a science magazine from the 80s or even older.

I read that article, too! I think I still have the hologram I made years ago on a CD cover using this technique...

I'm pretty sure that's Beaty that I mention in the video. He talks about a floating hand print somewhere on his website.

@@walterriblethegreat i tried it on a cd as well when I was a kid but my compass sucked and the hologram was pretty weak but still cool.

​@@hakajiru264a

Easily the most impressive thing I've ever heard. By far the best😁

@Xaddre Did you do that all by hand, still? Or do you also have some cnc machinery at home? How are the colors added, by different scratch depths? In some kind of CD-like surface? Really cool!

My mum's blind in her right eye as well. She calls us weird when we talk about seeing two fingers when you hold one up close in front of your face lol. For a few years I've really wanted to find a solution for people who are blind in one eye to be able to experience 3D sight. I keep wondering whether it might be possible for your brain to interpret overlapping images from one eye as 3D if those overlapping images were adjusted for where you were looking. One day I'll try it out. It would be difficult, however, because you'd need accurate eye tracking and very low response times. On the other hand, if it worked it might make returning to regular monocular vision seem really boring and flat, so there's the potential for making things worse haha. On another note, it only recently occurred to me why mum doesn't find reflections in the TV nearly as annoying as we kids do. Because of course, with binocular vision, we get the impression of the reflection being further away/not on the same plane as the TV screen. Worse, each eye sees a different image, which makes the image tend to "shimmer" and be even more annoying. It's the same effect when I'm trying to look at something up close that's reflective. I have to close one eye to get a clear image because each eye sees a different image and it's impossible to see anything clearly.

To be honest, I've never really paid attention to it. I think it's probably one of those things you get used to almost immediately unless you're actually looking for it.

​@@chaos.corner yup, same

@@clonkex Probably easiest would be to try this with a VR headset, somehow superimposing the images intended for each of the eyes to both just hit one eye

@@doctorpc1531 Yep, that was a thought I had, but I don't currently own any VR headsets with built-in eye tracking and I wasn't confident enough with the idea to spend money on an eye-tracking addon. Plus I already have enough uncompleted projects to last me a lifetime lol

engineering minds think alike :P

Haha, I just had the same thought exactly, or rather on how to build the CNC machine.

Once the software is created, would it be expensive to generate the etchings? I was wondering if they offer any for sale, but it doesn't look like it.

@@aaa303 Depends a lot on how much big acrylic sheets like that costs, and the time spent on logistics of buying material, manufacturing and selling. So in short, 'maybe'

@@aaa303 If such software for generating G-code for something like this existed, I would totally convert my 3D printer to have a knife or some sort of etching tooltip instead of a nozzle to make something. I hope James or someone actually makes software for this that is publicly available.

same. it just doesnt work for me no matter how hard i try

@@bermchasin I have to force myself to pick which eye to focus from. Optometrists my whole life have not really been able to offer much in way of assistance. Lasik they said would not take care of it, and a 2-3 year patch over the stronger one MAY help the other compensate. But, not worth the headache.

​@@nenelan wait, does that effect depth perception, if you can only be effectively using one eye at a time?

@@zackbuildit88 Correct! I have none. Sports in school was always a challenge.

@nenelan I'm the same. I've had monocular vision for as long as I can remember, I went through years of specialists when I was younger and I did the patch which did nothing. Lasik was one of the best things I've ever done, but that was probably more because I had 2 different focal strengths (I was born short sighted in one eye and long sighted in the other). I have "trained" myself to have depth perception by using my environment and referencing known lengths of different objects, but in open spaces it all goes - best example was when I saw the grand canyon and it looked like a flat painting

I did not know that was a thing, I'm astonished right now

@@DaedalusCommunity takes a bit to learn, but it's rewarding once you got it down.

@@oezzimix for me it sort of clicked instantly, i crossed my eyes and they immediately locked on the picture, blew my mind

@@DaedalusCommunity nice!

I have never been able to make the cross-eyed 3d thing work for more than a split second until this video. For some reason, i was finally able to hold focus on the “center” image. Every other time it would pull out of focus, but for the first time it just snapped in and i could see it without straining. Thanks Steve!

There's glass in some pavements.

Similarly the reason cat eyes look surreal at night - the cat's two eyes reflect the light source slightly differently back to your two eyes, causing a scintillating 3D effect which tricks your brain that the glowing eyes are almost hovering in front of the cat's face.

Great hobby with the kids, ey!

It makes me so happy that you're proposing "parker cube" not "mould cube"

@@SteveMould even when it's not Parker's fault we all know deep down it's still Parker's fault

@@SteveMould I wouldn't feel safe yet, "[insert name] tesseract" is still not taken.

​@@nahometesfay1112 haha

I don't know if this helps or makes it more confusing but one way to think about it is to compare it to looking through a window. If you cover most of the window leaving just a small hole to look through, you can still see the whole scene outside if you get up close to the opening and look through it at different angles.

@@Quantris Yeah, I'd heard that idea before, but it didn't really help me wrap my head around things. Like, the light from a window is all coming from somewhere else, and that doesn't help me conceive of how an entire scene can be recorded on every point of a surface. I guess it helps visualize a little bit how it's really just one very specific angle of said scene on each point.

@@chuharry5360 perhaps obvious but way underutilised

@@deadfishyarou if it were that obvious, everyone would use it 😂 Definitely underutilized though

Probably laser etching

@@beratplaygame5349 laser doesn't work, you need scratches with smooth rounded edges to create specular highlights.

...except clickspring. He'd probably disappear for another year or so, then just post a video going "...I hand-filed these diamond needles I then used to scribe a 360 hologram of the Sydney opera house into this brass plate..."

It can the CNC'd. The point is it involves a complex transformation with a 3d file and it's views as input. And I think the video's autor lose it...

It would be good if there was a video with just the cross eyed stereogram bits.

or perhaps a quantum superposition of one Steve in two places

@@neopalm2050 In which case Steve wasn't anywhere while he was making the video 😉

Me too, I like these 3d videos.

No, it's not your "autistic trait," silly. Many people find this fascinating whether they have autism or not.

Sometimes you'll see this in car paint when someone wipes the dirty surface with a towel. The grit acts like fine sandpaper and creates a scratch hologram of the towel. If they have their hand flat on the towel the hologram will encode an image of the hand with scratches of different depths corresponding to areas of higher pressure, so you get a kind of grayscale image of the hand. I'd suppose it's possible to machine a hard surface with a depth map of an object, pour soft silicone onto it, then use the silicone cast with a fine abrasive to etch a hologram with a strong grayscale effect.

You should try it out

The Visa Dove IS an etched hologram, a "surface hologram," composed of hundreds of thousands of microscopic reflective lines. But the lines are produced via optical interference, not by abrasion. The Viza dove is a Benton white-light hologram. These scratch-holograms are also Benton white-light holograms. The physics is the same for both, and that's the key to understanding them. In 1994, I originally invented these when I realized that, since Benton holograms are frequency-independent, this requires that the fringes in the Gabor zoneplate be size-independent. The fringe-spacing is irrelevant, and plays no role in 3D image-reconstruction. Therefore, we can draw real holograms by hand, with a sharp needle, but only if the holograms are of the Benton type, featuring only horizontal parallax. In a Benton "rainbow" hologram, if we increase the fringe-spacing to millimeters rather than microns, the hologram still keeps working, although it does lose the rainbow-banding artifact. Or said differently, the Viza Dove is an example of producing the tiny reflective lines of a "scratch hologram" by optical methods, rather than by surface-abrasion.

@wbeaty *Visa. You invented Benton white-light holograms? Wow. So, as I stated above, it's not a hand etched hologram. If it were there would be no need for a physical 3D object. Why use an extra step with a physical object when a computer graphic or illustration could be used instead? A 3D object hand-sculpted by my father. He did 100s of them in the 80s and 90s. They were cast in epoxy and shaded by airbrush.

I defocussed my eyes for those etched stereograms. They still worked.

It should be somewhat easier for cross-eyed, since with parallel stereograms there is a maximum separation possible (unless you are somehow able to point your eyes away from each other). Just look at your finger and bring it closer to you as you focus on it. Then do that same muscle movement without your finger. It's how to go cross-eyed.

WAIT. so the reason americans say to "go cross eyed" to see these is because YOU'RE ACTUALLY SUPPOSED TO?? Omg! I'm from Germany and the only ones I've ever encountered are the kind where you have to unfocus your eyes. It's always explained as "staring *through* the image" Watching this video i was kinda confused why it was harder to get the image to work than what I'm used to! Guess I'm rewinding and watching again, going actually cross eyed this time

I think the people having trouble doing cross-eyed stereograms are just watching this on their phone, and when something is right in front of you its hard to do. And parallel view sterograms are impossible on a computer screen because it's too big.

@@nonwibb I have been able to point my eyes away from each other as long as I can remember. But I think I've only found how to make one of the move-eye-inwards-muscles relax. I essentially disable they autopilot for making my eyes a suitable distance from each other where I don't see double. So even though I can control my eyes pretty well, my manual controls are far from the accuracy we have evolved to use instinctively. This means that they keep moving ever so slightly towards/away from each other even when I try to keep them still using this method. (When I don't do anything they work like eyes would normally do.)

Beaty's been in the biz longer than RU-vid, his website blew my young mind two decades ago

@@RoyWiggins Someone discovered that Charles Wheatstone almost invented scratch-holograms. He was examining lathe-turned disks under candle light, noticed the 3D stripe, and it led him to invent stereo (first the hand-drawings, later photos and the stereopticon.) We almost had Victorian Steampunk holograms.

It would take a very kind person to go to all that effort and release it for free. I'd be interested to buy it if someone does want to make it though! Or we could ask ChatGPT 👀

It just needs someone to make a crude attempt using popular coding tools and uploading to git hub and letting other random internet strangers slowly improve the code until it is as good as opensource 3D-printer slicer programs. I think a RepRap with a 500mW laser might be able to scribe these marks into a sheet of plastic.

If the groove is a smooth round bottom one then the inverse of it will be a smooth ridge, this will give a slightly BETTER result as the smooth curved potion is not recessed. However a raised surface is more vulnerable unlike a groove.

I wonder if you can stamp a CD out of chocolate

@@Scribblersys Hmm, Hypothetically possible but might not work with the regular master mould/stamper as this makes the pits into the BACK of the disk that are read THROUGH the plastic with the silvering (aluminium) on the stamped side that is then varnished for protection and to allow printing. For a chocolate disk you would have to use a unvarnished CD as a stamper and then aluminise the chocolate (might be tricky to reach adequate vacuum) and offset the disk so that the CD player would find the reading layer at approximately the right distance from the reading head. Protecting the delicate surface from dirt and scratches would make the disk very vulnerable.

Depends on the material I think. It needs to be a clean scratch, and laser engravers vaporize plastic leaving a white line and CNC machines tend to be very rounded so it may work but I don't know for sure

Nice idea

Those go as far as making the light interfere at the level of the wavelength to make the hologram genuinely indistinguishable from if the actual thing were there. With these, your lenses still focus at the depth of the surface, even if your eye-seperation-based depth perception disagrees. With traditional holograms, even the lens you'd use to focus the image is the one for the image's depth rather than the surface's depth.

the Thought Emporium made a video about making them, it works using laser interference on a piece of film when you make the film, you split one laser into two, send one into the film directly but reflect the other off the object, this exposes the film with an interference pattern, which is basically Interference = Clean laser - Object laser. When you want to look at the film, you shine the clean laser onto the film, and Clean - Interference = Object laser

@@neopalm2050 does this mean that this video's hologram is basically a fancy stereogram?

@@neopalm2050 Why does your lens still focus at the depth of the surface with these? Binocular vision depth-perception and focus depth-perception are both about parallax effects, it's just that binocular vision uses the distance between your eyes, and focus uses the distance between different sides of the pupil of one eye. Even with one eye closed you still perceive things from different viewpoints, those viewpoints are just close together as they are all within the one pupil.

@@1224chrisng No. A stereogram is just two images, which need to be interpreted as a 3D thing by your eyes. A true hologram gives you an entire light field, which tells you everything that can be known about the light at the panel at which the hologram is displayed. As I said, you'd use lenses with different focal lengths for each case. Also, if you look at a stereogram from a different angle than the one you're supposed to, it will look distorted, while for a hologram, you have total control over the image at every angle (up to the diffraction limit (I think?)) if you can find a way to produce such a hologram. As for the things in this video? I'd put them somewhere between stereogram and hologram. They give about as much control over the image from a human standpoint as a hologram would, but they don't actually give a light field at all.

liam get boo boo? need milky bottle?

@@username4441 what is your goal here?

@@NitronF117 don't bother. The commenter just wants attention. Ironic, right?

@@sandasturner9529 It’s certainly possible. I try not to assume the intentions of others.

@@NitronF117 It is odd that people complain about something that is inevitably going to happen. You are commenter number 3 out of 2000 to be upset but the abrupt end of the stereo portions. Others took it in their stride and laughed about how there were two faces to replace a stereo view or a scratch hologram. So perhaps User Name is a troll but in a sense you are too. If you practice with stereograms you get used to the non-standard eye movements and it is just one blink and you can reset to normal by looking at a familiar object. Try it again with this video if you want to practice. Offer the advice to others that are struggling.

You can actually see the effect with any size groove (or mound/tube)! The layer lines may be an issue for 3D printing, but it should theoretically work. When I first learned about this technique years ago I considered making a large sculpture with polished wire to create a hologram, but the wires in front block the glint from the wires in the back. So you have either have consistency(very few wires) or resolution (lots of wires), but not both.

Yeah it feels a couple feet away is best for me. Though depending on the pattern / backdrop environment it can also happen outside that range for me

Actually with regular stereograms, the trick is to diverge, not converge, but not everyone can diverge at will easily. The thing is: for convergence, the stereogram needs to be built with reversed depth, otherwise it's depth-axis inside-out.

@@scififan698 there are parallel view stereograms and cross eyed stereograms. In parallel the left image is on the left and right on the right. In cross eyed on the other hand, the left image is on the right and right on the left. If you look at the wrong the depth is inverted. Just wanted to expand a little on what you wrote.

@@mikeuk1927 yes, and for these 'parallel view' stereograms, I found that a lot of people can't pull it off, because diverging the eyes (looking far away, as opposed to the easier cross-eyed) seems to be harder to explain or execute. It is the more natural way though, because it corresponds to what we do when looking far away.

Yes that's what I'm taking about, can you tell me where I could find those images?

@cheesecake there's some good parallel view stuff here www.reddit.com/r/ParallelView

for crosseye stereogram its actually easier if the monitor is far away from your eyes. Getting up close to the monitor helps for parallel stereograms

@@merren2306 Not for me. Though Steve suggested that these are not crosseyed ones, so maybe that's the difference? Basically, I think that a lot of us are used to using 3D VR headsets where our eyes are right next to tiny images, so it's easier for our muscle memory to figure out how to focus. But maybe I'm weird. :-)

@@thewiseturtle the apparent focal point of a VR headset is actually infinitely far away

I can, usually without any effort, but i was struggling with the ones in this video for some reason. Probably because i haver looked at moving stereograms before. How i trained too: everyone say you should look at them cross eyed, i dont (well i dont start off being x-eyed) i try to look straight through them and focus "behind" the images, then they start too merge (when the eyes start going x-eyed without thinking about it).

It helps me to make the window very small at first, and when I get back into it I can make it larger and larger. That way you don't need to move your eye that far to start.

@@markkalsbeek5883 You make a important point. With cross eyed most people can handle large convergence angles. With divergent look very few people can diverge beyond infinity focus where the eyes look straight ahead. This means with divergent stereograms it is very difficult to achieve alignment if the images are wider than your eye spacing (60-75mm), with cross-eyed look one can train to handle large images, I can easily make two 20" (diagonal) monitors at arms reach come together by squinting.