Model of a Penrose staircase
1968
1968
1968
1967
1839 (original); circa 1988 (replica)
1967
(1962); 1982
4000-2001 BCE
2000-100 BCE
1967
1968
1967
1967
1967
1968
1980-1950
1967
1990-95
1903 (original); 1982 (model)
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
circa 1967-1968
1967
6000-5000BCE
1967
1959 (designed); 2001(made)
1968
2050-1750 BCE
1968
1888; 1984
1967
1968
1967
1990-96
1976; 1776
1968
1967
8500-2000 BCE
2000-1001 BCE
circa 1967
1968