Cave art is really cool. Art, generally, is the process by which we participate in the creation of reality and become like our Heavenly Father, and nowhere is that more readily apparent than in cave art. Practically all cave art is art of nature, and so it makes extensive use of the feedback loop between environment and organism. It also feeds into the idea that humans need beauty to survive, so in a less beautiful place such as a cave, we will bring the beauty in from outside through art.
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