
Model of a Penrose staircase
1968
1968
1969-1970
1969
1974
1969
1974
1973
1968
1976
1970-1971
1971
1976
1972
(1962); 1982
1839 (original); circa 1988 (replica)
1970-1975
1970s
circa 1972
circa 1968
1975
1968
1990-96
1971
1974
2000-100 BCE
1976
1968
1968-1972
1971-1975
1970-1975
1990-95
1976
1970
1968-1971
1973
1971
1969
1973
1976
1970
1971
1970
1972
1973-1974
c.1971
1975
1975
1969
1975
1959 (designed); 2001(made)