Sand plotting is accomplished by machines I call "Sisyphus." I built the first using Cartesian geometry (standard XY). Sisyphus II is larger, and utilizes polar geometry (theta R). (See the Sisyphus Page, for more info).

 

Click to Enlarge:
	cloverleaf spiral Sisyphus I. 1999
	colored light experiment Sisyphus I 1999
	Sisyphus II Science Museum of Minnesota's old building. 2000
	colored light experiment Sisyphus I 1999
	Sisyphus I 1999
	Early Stratograph development 2001
	Stratograph experiments 2001