Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Sketch of detail

Black ink and purple watercolor, with touches of white gouache, on off-white wove paper; verso: black ink and graphite

Incised line and Aquarelle on white wove paper

Oil on white prepared paper

Black ink, graphite, and yellow chalk on off-white wove paper

Graphite on very thin cream laid paper

Graphite on paper

Watercolor and graphite on thin cream wove paper

Black ink, graphite, and yellow chalk on off-white wove paper

Black crayon on paper

Graphite on off-white laid paper, mounted to cardboard

Graphite on off-white wove paper

Charcoal on cream laid paper