Model of a Penrose staircase
1968
1968
1969
1968
1839 (original); circa 1988 (replica)
(1962); 1982
2000-100 BCE
4000-2001 BCE
circa 1969
1969
1968
1969
1969
1968
1968-1969
1980-1950
1990-95
1969
1903 (original); 1982 (model)
1969
1969
1968
1969
1968
1968
1969
1969
1969
1968
1969
1969
1968
1969
1968
1969
1968
1969
1968
1969
1968
1969
1969
1968
1968
1969
1969
1969
1969
1969
1968
6000-5000BCE