Martin Wattenberg and Marek Walczak's Thinking Machine 4 is not your usual computer chess. When you move your piece, the computer's thought process is then sketched on the screen as it ponders its move:

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.

The orange lines are potential moves by black (computer) and the green is white (player).

Go ahead, just give it a try and watch the computer think: Link - via Cliff Pickover's Reality Carnival