Just a quick note. One of the upcoming challenges is called Triangle Composition. I had a quick look at Google Images for "Triangle" and found a site that shows you how to build a Penrose Impossible Triangle. It creates a really cool optical illusion which Escher actually used.
http://www.coolopticalillusions.com/build-an-impossible-triangle.htm (picture from there as well)
http://www.coolopticalillusions.com/build-an-impossible-triangle.htm (picture from there as well)
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