I reimplemented Jeff Minter's Psychedelia in the browser.

You can see a little about the internals of at my github page.

You can play with it inline below. Try clicking on the screen and pressing P, that should change the pattern used to generate the display. If you look at the left hand side you can see the other keys available for manipulating the display, for example X to change the X-Y Axis.

If you press O to turn off the Demo Mode you can even use your gamepad or the arrow keys to generate the display yourself.

I think it looks kind of smart.