
Model of a Penrose staircase
1968
1968
1969
1969
1968
1963
1830 (original); 1967 (model)
1964
1964
1963
1964
1967
1965
1966
1963
1976
(1962); 1982
1839 (original); circa 1988 (replica)
1967
1964
circa 1968
1968
1965
1963
1990-96
1965
1965
2000-100 BCE
1964
1966
1968
1967
1990-95
1965-1969
circa 1964
1965
1969
1966
1966
1963
1965
1969
1966-1968
1959 (designed); 2001(made)
circa 1969
1965
1966
1963-1967
1903 (original); 1982 (model)
circa 1965
4000-2001 BCE