
Model of a Penrose staircase
1968
1968
1969
1969
1968
1976
(1962); 1982
1839 (original); circa 1988 (replica)
circa 1968
1968
1990-96
2000-100 BCE
1968
1990-95
1969
1969
1959 (designed); 2001(made)
circa 1969
1903 (original); 1982 (model)
4000-2001 BCE
2050-1750 BCE
1968
1968
1798 (original); 1977 (model)
2000-1001 BCE
1969
1968
1969
1888; 1984
6000-5000BCE
1969
1968
1501-1600; 1972
1976; 1776
1968
1991-1783 BCE
1969
1968-1969
circa 3000 BCE
1968 - 2000
8500-2000 BCE
1969
circa 1968
1968
1701-1800; 1982
1920-1933
1969
1969
1968
1968
circa 1969