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Graphic Design I guess? I used a mouse.
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Notes
The optical-illusion that this graphic is a shameless rip-off of inspired by is commonly misattributed to M.C. Escher. It was actually created by a rather interesting bloke named Roger Hayward, who created a similar but more elaborate drawing of a tower in a similarly impossible three-pronged shape.
The simplified version of the image is so widespread that it is generally considered to be public domain (it was on the cover of MAD Magazine in the early 60s, which is where I thought it came from originally). I'll take my chances.