Imi Knoebel (d.i. Knöbel, Wolf) "DIN I G1-G4" Each part titled on the reverse: DIN I G1, G2, G3, G4 resp. Signed and dated with brush in red, yellow and blue on G4: IMI 95 1995 Work in four parts: Each acrylic on aluminium square-type tubes over wooden core Jeweils 34,1 x 25,3 x 8,1 cm Imi Knoebel. Rot, Gelb, Weiß, Blau. Aachen, Ludwig Forum für Internationale Kunst, 1996, no cat. no., colour ill. p. 34 Each 34,1 x 25,3 x 8,1 cm