Ancient people crawl a mile into dangerous, absolute darkness to make art no one would see because the cave itself was a symbol. It was the belly of the earth, a womb: entering the cave is a return to the mother, a place of origin for every person.
One of the earliest discoveries of cave paintings was also deeply symbolic. It was found by a child.
In 1879, a Spanish amateur archaeologist Marcelino Sanz de Sautuola decided to explore a cave and he brought his 8-year-old daughter, Maria, with him. While Marcelino was looking down at the ground for stone tools, Maria looked up at the ceiling and saw something her father missed. She had discovered magnificent, colorful paintings of ancient bison.
Sadly, the "professional" academic world of that time did not believe Marcelino. They accused him of forging the paintings because they could not believe prehistoric humans were capable of such beautiful art. Years after Marcelino passed away, other caves were found in Europe, proving that the Altamira paintings were real.