Model of a Penrose staircase
1968
1968
1967
1967
1839 (original); circa 1988 (replica)
1967
(1962); 1982
1990-96
1903 (original); 1982 (model)
2000-100 BCE
4000-2001 BCE
1968
1967
1967
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1967
1980-1950
1968
1968
1968
1967
1968
1990-95
1830 (original); 1967 (model)
1967
circa 1967-1968
1968
1967
1959 (designed); 2001(made)
2050-1750 BCE
1968
1967
1888; 1984
1967
1976; 1776
1967
8500-2000 BCE
2000-1001 BCE