Frank Stella is a legendary artist who has been creating amazing work for over 50 years, and as far as I know he's still going strong. I love to look at his works and see the changes over the years, as well as the stylistic thread of continuity.
This one is from 2001.
Done in 1969
Sorry I didn't manage to get these up in proper chronological order, but you get the idea. Pretty great, huh? If you have time to explore the San Francisco Museum of Modern Art website, you can see lots of Frank's work, and watch a video as well. When you have time, google up his name and prepare to be amazed.