Jackson Pollock was more than a great artist, he was a creative force of nature. He changed not only the course of Western art, but our very definition of "art." He was the quintessential tortured genius, an American Vincent van Gogh, cut from the same unconforming cloth as his contemporaries Ernest Hemingway and James Dean--and tormented by the same demons; a "cowboy artist" who rose from obscurity to take his place among the titans of modern art, and whose paintings now command millions of dollars.