@futurebird Marvelous thread!
I'm thinking a couple things:
faces are hard to draw well;
the cave folks already knew what each other looked like, so they didn't need instructional art showing people faces;
kids back then would also have drawn faces right off, but either they weren't allowed to touch the 'good' art materials in the cave, or were only allowed to draw on impermanent materials
https://deacon.social/@Bodling/113538886154209570
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