This is unusual. I can't believe how much work must have gone into this painting. The painting itself is a nice work of art, but as you run your curser over the people it tells you who they are. If you click on that person, a link is provided (if you click) to get more information on each individual pictured. This could keep you occupied for hours and teach you much, too. Enjoy.
http://cliptank.com/PeopleofInfluencePainting.htm