
Model of a Penrose staircase
1968
1968
1969-1970
1969
1976-1979
1960
1974
1969
1974
1979
1973
1978
1978
1959
1968
1976
1963
1830 (original); 1967 (model)
1964
1981-1983
1960
1960
1970-1971
1964
1963
1984; 1983
1964
1971
1960-1970
1961
1967
1970-1981
circa 1983
1965
1978
1966
1982
1963
1970-1981
1976-1982
1960
1979
1976
1972
1958
(1962); 1982
1839 (original); circa 1988 (replica)
1962
1967
1960
1970-1975