A Window (Ein Fenster), 1962
Ink and Gouache on cardboard
Flowers for My Daughter Barbara (Blumen für meine Tochter Barbara), 1963
Venice, Palazzo Guggenheim (Venedig, Palazzo Guggenheim), 1966
Gouache and ink on Japanese paper
Ibiza 1966, 1966
Gouache and paper on Japanese paper
Cala Xaracca II, 1972
Gouache and ink on Japanese paper
Homage to Gerd Boder I (Hommage an Gerd Boder I), 1973
Gouache and ink on Japanese paper
Estate Hans and Hilde Kaiser
The Old Squares Are Not Empty Yet I (Die alten Plätze sind noch nicht leer I), 1973
Gouache and ink on Japanese paper
The Big View (Der große Blick), 1973
Gouache and ink on Japanese paper
Santorin, View of Thrissa (Santorin, Blick auf Thrissa), 1977
Gouache and ink on Japanese paper
On the Terrace II (Auf der Terrasse II), 1978
Gouache and ink on Japanese paper
The Unforeseen Spaces in Space I (Die ungeahnten Räume im Raum I), 1978
Gouache and ink on Japanese paper
Blooming in the Bright Room II (Blühen im lichten Raum II), 1981
Gouache and ink on Japanese paper
The Large Rooms III (Die großen Räume III), 1981
Gouache on japanese paper
Museum Wilhelm Morgner, Soest (permanent loan from the Estate Hans Kaiser)
The Large Rooms IV (Die großen Räume IV), 1981
Gouache on japanese paper
Gustav-Lübcke-Museum, Hamm
Universal Space V, Cerulean Blue – The Sky (Universaler Raum V, Coelinblau – Der Himmel), 1981
Gouache on japanese paper
Schroth Collection, Soest