
Model of a Penrose staircase
1968
1968
1969-1970
1969
1969
1968
1830 (original); 1967 (model)
1970-1971
1971
1967
1966
1976
1972
(1962); 1982
1839 (original); circa 1988 (replica)
1967
1970s
circa 1972
circa 1968
1968
1990-96
1971
2000-100 BCE
1966
1968
1968-1972
1966-1970
1967
1990-95
1970
1968-1971
1971
1969
1970
1966
1971
1966
1970
1972
1966-1970
c.1971
1967-1972
1969
1966-1968
1959 (designed); 2001(made)
circa 1969
1966
1903 (original); 1982 (model)
4000-2001 BCE
1967
1967