Lunarian Lies | Over Analyzing Houseki no Kuni Chapter 9 

Quite an interesting video with a few details I haven't noticed before, especially the one about Phos/Ventrico*sus* positions in the frames. Adding to what you said, I think this is one of the most important chapters in the whole manga. As you mentioned, this is the first time the word "human" appears in the manga and it comes with a quick exposition of what the three races are: bones, flesh and soul. It gives us a better understanding to all the characters we see and their motivations and emotions. But it's not just that. This is also the beginning of Phos' change. And I am not saying that just because they got their legs crushed to gem dust but because it is the first time they were exposed to such knowledge - about humans and lunarians. And, of course, Phos, being innocent and stubborn and trusting in Kongo's teachings, didn't quite understand it at first. But as Ventricosus said, they have already stepped on the path they couldn't turn away from and the fact that this conversation is one of the few things Phos remembers, confirms that they, in fact, gained an interest in learning what humans are, which will turn in what we have now...

I wonder how the Admirabilis survived on Earth since they allowed the Lunarians to take them away cause lack of resources in the firstplace. Also interesting they can reproduce between siblings without issue