.
D

D
Relativity 
(lithograph, 1953)
D





DD 
D


D
D
Relativity is one of  his most famous impossible structures.  During the early 1950se, Escher gained popularity as a lecturer. He was in demand both for artistic audiences, and for scientific ones. He also held his first one-man exhibition in the United States. It raised US awareness of Escher's work.
D
D