10,000 BCE. According to the evolution of consciousness (which is what the Mayan calendar precisely
describes) people underwent a significant consciousness shift in 3115 BCE leading them to create civilizations
and before that point in time I suggest they were in a default state akin to that given by psychedelics.
So if we find that the cave painters 40,000 years ago created art that was in a floating state it was
simply done in their default sate of consciousness, which was very different from what is now.
Without this cosmic evolution of consciousness there would never have been any civilization.