This page about a fractal representation of tic-tac-toe is from Fractal Images of Formal Systems. I don’t understand the larger work, but the image is very cool: it shows the progress of a game of tic-tac-toe by drawing the next state of the board in the square the current player fills. Words don’t do it justice, go take a look. Even better is the animated version (clever titled tic-frac-toe), which lets you actually play the game, zooming in to see the branching possibilities visually represented. End states are represented as colored squares showing who won. Very clever.