
Model of a Penrose staircase
1968
1968
1969-1970
1969
1969
1968
1976
(1962); 1982
1839 (original); circa 1988 (replica)
1970s
circa 1968
1968
1990-96
2000-100 BCE
1968
1990-95
1970
1969
1970
1970
1969
1959 (designed); 2001(made)
circa 1969
1903 (original); 1982 (model)
4000-2001 BCE
1970
2050-1750 BCE
1968
1968
1970
1970
1970
1798 (original); 1977 (model)
2000-1001 BCE
1969
1968
1969
1970
1888; 1984
1968-1970
6000-5000BCE
1970
1970
1969
1968
1501-1600; 1972
1970
circa 1970
1970
1970
1976; 1776