This unforgettable clay animation by Joan Gratz covers most of modern art in about 6 minutes. This film has been a favorite of mine since I first saw it many years ago and I was happy to have the chance to share it with my kids.
I can hardly imagine the huge amount of work that Gratz must have put into animating this short film using clay. If you watch it, you'll see what I mean.
(It depicts many well known works of art and does have some nudity in it, so be forewarned if that bothers you.)