Artist: MC Escher
Title: Tetrahedral Planetoide
Escher is officially my favorite drawing artist of all time. The second I saw this I thought "Escher found Atlantis and did not tell anybody!" It is almost like each point has what its adjacent point doesn't have. One has a concave circular stadium type structure, and its adjacent point has a convex dome that counteracts it. What is also cool is the illusion that in one vantage point it actually looks flat (if you focus on just the circle around it). However in another vantage point, when looking at the structures themselves) you can definitely get the 3D feel.