Here is a new forming collection of drawing tools, starting with software spirographs.
Did you ever play with a Spirograph kit? It contains gears which move around inside or outside a frame. Some gears are hollow, so small gears can revolve inside them. To draw a picture, one puts a pen in a penhole and pushes the pen along to move the gear around, drawing the motion of the gear at the same time. Search for Spirograph images in a browser and you'll lots of different Spirograph patterns.
It requires care and concentration to make a good pattern. The frame must be held down on cardboard with pins. The paper then has pinholes in it, which can rip and tear as one adds additional drawings over the top.
Now with computers so powerful as they are, what can machines do? Not only can they draw the diagrams, but also the shapes can be played as sound. Here is a simple Spirograph design, and some patterns drawn with structures built in Native Instruments Reaktor 5.5: