Have your computer draw a shape with any number of sides with Spirograph by I. Doyle of Little Sutton, Cheshire. Besides telling the computer how many sides you want, you can move your shape up and down by using : and ? or left and right by using Z and X.

The same keys also allow you to use the program as a sketcher if you type in 1 when asked for the number of sides. Pressing . will make the shape smaller, ; makes it bigger and pressing the Space bar will start the program again.

Try typing numbers with a decimal point for some interesting shapes.