The Laser Billboard

http://www.circuitcellar.com/pastissues/articles/misc/86-prutchi.pdf

Down this end of the Earth, Oatley Electronics, and others, in
Australia sell kits (no specific details given but it's similar to the
CC article)

http://www.oatleyelectronics.com/lasers.html

I've seen others too, that use motors (standard or stepper) or voice
coils from speakers or hard drives

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