Kaleidoscopes are terrific! Translucent, colorful, sparkly mandalas!
Like I need another way to waste time in front of the computer.
This digital kaleidoscope by Dinesh Vora is a wonderful thing to stare at for a while. (You'll have to go to the link to see it.)
Also, if you move the mouse over the image you can affect its movement.
(The kaleidoscope: another great thing invented by a Scot: Sir David Brewster, 1817)