Spiraling Lasers Light Show
A Laser and three motor spinning mirrors controlled by an Arduino generate spirograph-like patterns on your walls or ceiling.
See SpiralingLaser.pdf for details.
See Also: http://www.instructables.com/id/Spiraling-Lasers/ http://www.instructables.com/id/Laser-Lumia-Light-Show/
Warning! Laser pointers should not be considered as toys. The laser module used here is relatively low powered, but should still avoid any direct eye contact. DO NOT EVER SHINE LASERS INTO ANYONE’S EYES, including pets, kids, airplanes or yourself. Eye damage is irreversible!