Cool web page:
Play chess where you can watch the computer think as it plays you - it sketches a colored line for every possible move it's thinking about. After a while, you see this web of lines visualizing the possible moves, anyways, it looks VERY cool - plus, it's not impossible to beat it (but enough of a challenge to not be boring!). Have fun.

Thinking Machine 4: "The artwork is an artificial intelligence program, ready to play chess
with the viewer. If the viewer confronts the program, the computer's
thought process is sketched on screen as it plays. A map is created
from the traces of literally thousands of possible futures as the
program tries to decide its best move. Those traces become a key to the
invisible lines of force in the game as well as a window into the
spirit of a thinking machine."