The Chow-Ruskey Order 5 Venn Diagram
There are five polygons made up of touching squares, colored red, blue, yellow, green, and gray. You can see them most clearly at the opposite ends of the opacity slider. The small squares represent all 32 combinations of being in or out of one of the five polygons. The polygons can be stacked in 120 different ways. Each square contains the same color information, but the ordering is important for the way the coloring looks to the eye.
Stirling Chow, Frank Ruskey. http://arxiv.org/abs/math.QA/0603068