Choose a picture from among the following:
Hopper, "Nighthawks"
Picasso, "Guernica"
Homer, "Breezing Up"
Caillebotte, "Rue de Paris"
Van Gogh, "Cafe Terrace at Night"
If you missed the powerpoints for these, a version of them can be found here. The first was "How Pictures Work," and the other was "Mann and Rockwell." Make sure you're clicking on the links at the bottom--the ones that show dates with them--instead of the ones at the top.
Also, if you missed one or both powerpoints, make sure you get notes from a friend you trust.