One of the reasons I love literature (another form of art) is that so much of an author's experiences are reflected in his work. In addition, his view of the time period he's writing in and about are infused into his writing. The same is true for art. What he sees and hears and thinks about--all part of his world--show up in the colors he chooses, the medium he chooses, and the perspectives he chooses, among other things. No one really lives in a vacuum, so the experiences he lives through are necessarily part of whatever he creates.