Robert Rauschenberg (1925-2008) was one of the last of a generation that changed the face of art forever. Read the New York Times article, which has some terrific stories and quotes like this one:
"I usually work in a direction until I know how to do it, then I stop,"
[he said in an interview.] "At the time that I am bored or
understand — I use those words interchangeably — another appetite has
formed. A lot of people try to think up ideas. I’m not one. I’d rather
accept the irresistible possibilities of what I can’t ignore."