Model of a Penrose staircase
1968
1968
1968
1839 (original); circa 1988 (replica)
(1962); 1982
2000-100 BCE
4000-2001 BCE
1968
1968
1980-1950
1990-95
1903 (original); 1982 (model)
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
1968
6000-5000BCE
1959 (designed); 2001(made)
1968
1798 (original); 1977 (model)
2050-1750 BCE
1968
1888; 1984
1968
1990-96
1976; 1776
1968
8500-2000 BCE
2000-1001 BCE
1968
1968
1991-1783 BCE
1701-1800; 1982
circa 3000 BCE
1968
1968
2000-100 BCE
8500-2000 BCE
10000-5001 BCE
1975-1978
1501-1600; 1972
2800 BCE
1968