We’ve seen some awesome logic paradoxes before, but let’s examine a few visual paradoxes that would make great mental warm-ups for your class!
1. The Penrose Triangle
The [Penrose triangle](http://en.wikipedia.org/wiki/Penrose_triangle), featured in M.C. Escher’s *[Waterfall](http://en.wikipedia.org/wiki/Waterfall_(M._C._Escher))*.
2. The Penrose Stairs
Escher went on to use the [Penrose stairs](http://en.wikipedia.org/wiki/Penrose_stairs) in his work, *[Ascending and Descending](http://en.wikipedia.org/wiki/Ascending_and_Descending)*. Featured in *[Inception](http://www.wired.com/magazine/2010/08/the-never-ending-stories-inceptions-penrose-staircase/)* as well.
3. The Blivet
The Blivet looks like a crazy ‘E.’
4. The Impossible Cube
The [impossible cube](http://en.wikipedia.org/wiki/Impossible_cube).
Image from 4C
5. The Möbius Strip
Photo by Spacemanbob
Standing out from the crowd, Möbius strips are great since kids can actually, and easily, build them. A two-dimensional shape with only one side.
Also offers a perfect opportunity to discuss the umlaut!