Comment by roughly

One thing I read a while back noted that the cave paintings were also painted under and for specific lighting - namely, dim, flickering fire - and that under those conditions the paintings took on an even more expressive character.

What’s wild is that would be true for every single human work up to about the mid-1800s. Art - and architecture - would be made to be seen either in sunlight, with its attendant shadows and shifts throughout the day, or by firelight, which flickers and shifts on its own.