P.S. Just my opinion, please don't downvote (or downvote just this comment, it's separated for that reason): I don't believe creativity in arts equals genius. I find that most of the expensive pictures of old plain and simply suck and are only popular/expensive because of their exclusivity and because the people who can afford them are willing to pay that price (I understand that - I would probably want to buy the first painting a human ever made).
I don't mean Leonardo Da Vinci and others who created new processes for painting - I mean specifically the squares, buckets of paint on canvas and Picasso-like LSD-induced paintings, which are just works of art, not genius. Any decent artist with Photoshop can do better nowadays.
I was recently at the Metropolitan Museum of Art in NYC, and I saw many paintings that were, in my view, works of genius. One in particular was a 19th century, full-length portrait of what was clearly a bored teenager. That is, I could clearly tell, through facial expression and posture, that this young woman was bored. My claim is that the artist who made it had a genius-level understanding of how to paint people. He had to be able to consciously recognize the visual cues that most of us unconsciously process, and he had to be able to convey that in paint. Because of the thought processes required to create it, I consider it a work of genius.
These 'squares' and 'buckets of paint' are part of a historical view to understanding the history of human development and I would consider you look at each period of art as more than just figurative representations of light, but as representations of how we view ourselves and our humanity. We can go back thousands of years and trace how society has grown through art, from the rock paintings of thousands of years ago when they believed the spirit of the animal existed in it's figurative representation, reflected in the animal worship and the full respect of nature of those cultures, to the 20th abstract work where advances in psychology, human rights, education, etc, lead us to the postmodern age we live in now, where not everything is black or white or is the way it is just because it looks a certain way. Art, great art, has a way of representing who we are, and I would contest your argument that it does not take a genius to unveil the intricacies of a human mind.