sculpture: m.c. escher with lego
the impossible staircase from escher built with lego
http://www.andrewlipson.com/escher/relativity.html
http://bergoiata.org/fe/Escher-lego/10.htm
some works of escher on the net
http://www.math.technion.ac.il/~rl/M.C.Escher/
