The Penrose Triangle (aka "Fun With Dimensions")
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No, not Barbie dolls, I mean, in the cognitive or math sense, as in - something that is physically unachievable, but because you're looking at it in 2-D on the screen, seems reasonable.
Ok, fine, Barbie counts too (as do comic characters, the female ones in particular. Also, anything by Rob Liefeld)
The one to the right has always been one of my favorites - its a Penrose Triangle.
Yup, that Penrose. The one with the seriously awesome mind and the Kleenex lawsuit.
Incidentally, if the above looks vaguely Escher-like, its not surprising - it was inspired by some of Escher's works.
Incidentally, Escher's most famous paintings (the staircase one, and the waterfall) were inspired by an article that Penrose wrote. From Teh Wikipedia
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