Random Dot Stereogram
Random Walk Kennedy
1967
Random War
1967
Random light and shadow
1967
Rectangles yellow, blue and black
1953
Redundanz 0,32
undated
Redwindow
1923
Relache02
1992
Relief 14/268 Auflösungszeichen
1968
Relief
1966/67
Repentirs
1992
Return to Square A
1967 / 68
Return to Square B
1967 / 68
Rolled Wrongly
1931
Roman views angel choir fresco
1954
Rotating Hypercubes
Rotationen
about 1970-73
Rotozaza
Running Cola is Africa!
1968
Répartition
1961
Röntgenaufnahme
1958
Röst
1959
SAWDUST
SCAM1
1973
SECLUX15A
1973
Salsa Samba
1979
Sandwich
Schachtrote
1918
Scherzo For Matrix and Figures 96990
Scherzo For Matrix and Figures 992