Optical illusion inventor goes on to invent copyright threats against 3D printing company

Yesterday, I blogged about Artur Tchoukanov, who figured out how to make a 3D printed "impossible" Penrose triangle. Turned out I didn't have the details quite right. The guy who came up with the 3D design in Thingiverse had made it after seeing someone else's model for the same thing on Shapeways, and he'd made the triangle design to show that he'd figured out how the trick was done.

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Optical illusion inventor goes on to invent copyright threats against 3D printing company