Chalk is fun to draw with, and some people even get really good at using it to make art on the sidewalk ... by a stepper motor with the aid of a 3D-printed geartrain that helps give it enough ...
Artist Tracy Lee Stum created this 3D sidewalk art in Lake Worth, Texas, in 2013. The Washougal Arts and Culture Association wants is looking for artists to create 3D, optical-illusion paintings ...
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