Langton's ant

Controls:
Click on the screen to add (invisible) ants. Start the simulation with the space bar. Note: You have to add at least one ant, you can't add more than seven.
Watch.

If you want to see a diagram showing how many cells are filled with each color, click "escape". Then you can either return to the simulation with "space" or start from the beginning with "enter".

Background:
Ant is moving one step.
It changes the color of the cell and turns left (if the cell was white) or right.
Then it moves a step and so on.