[ScubieNuc]

My bet is all of these drawings were done by kids with time on there hands. Scratching out a living with your hands is hard work and requires you to be vigilant during every waking hour.

Only kids get exempted from that at times. I can also imagine that adults wouldn’t have wasted there time with something that didn’t put meat on the table or furs on their backs.

[Adder]

I can see adults doing so. If you thought your furs and food depended on pleasing the gods and spirits you would take the time.

The great temples and cathedrals were built by folk living a hardscrabble existance.

[6SJ7]

My bet is all of these drawings were done by kids with time on there hands. Scratching out a living with your hands is hard work and requires you to be vigilant during every waking hour.

"How many times have I told you kids, don't draw on the walls!!"

[Wonder Warthog]

"I can also imagine that adults wouldn’t have wasted there time with something that didn’t put meat on the table or furs on their backs."

Actually, hunter-gatherers typically had lots of free time. Dawn-to-dawn backbreaking labor only came in with farming.