Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Staircase: plan, sections, details, 1:20, 1:5

Graphite on paper

Black ink and gray wash on cream laid paper

Black chalk and charcoal on off-white laid paper

Watercolor and graphite on cream wove paper; verso: black ink and graphite

Graphite on paper

Black ink, charcoal, and watercolor on cream laid paper, edges taped

Watercolor and graphite on cream wove paper

Black and colored crayon on off-white wove paper

Graphite and black ink on off-white tracing paper

Black ink and graphite on off-white wove paper

Graphite on cream wove paper

Black ink and graphite on thin buff wove paper