the author of this app says:
Oohhhh how pretty! Do you remember, as a child, looking into a tube and seeing pretty colors changing in a circle? Yes, I'm referring to a Kaleidoscope. This application gives you the fun of a kaleidoscope without the long tube.
By tapping on the screen, you can make a beautiful collection of lines swoop across to form a generic image. You can also put the application on auto, so all you have to do is sit back and watch the colors change.