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What does this figure represent?

If you guessed "battle of the sexes," you are correct.  The figure illustrates a theorem concerning the geometry of the set of solutions of a noncooperative game, as it applies to the 2x2 game known as battle-of-the-sexes.   (He prefers the boxing match, she prefers the ballet, but they would like to go somewhere together rather than separately.  What should they do?)  The blue saddle is the set of independently randomized strategies. The red hexahedron (with three more faces and one more vertex on the back side) is the set of correlated equilibria. Their three points of intersection (red dots) are Nash equilibria.  The sensible solution is not a Nash equilibrium.  For more details see the following paper.