Escher's "Ascending and Descending" in LEGO(andrewlipson.com)
andrewlipson.com
Escher's "Ascending and Descending" in LEGO
http://www.andrewlipson.com/escher/ascending.html
1 comments
The 'Relativity' one is also quite nice: http://www.andrewlipson.com/escher/relativity.html