Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Penthouse: plan, sections, 1:50

Colored chalk on brown wove paper

Watercolor on off-white card

Charcoal on white wove paper

Black crayon on gray wove paper

Watercolor on off-white wove paper

Charcoal on off-white laid paper

Black ink on cream wove paper

Watercolor and white gouache on illustration board

Watercolor on ruled off-white wove paper

Graphite, watercolor and white gouache on brown wove paper

Graphite and colored pencil on paper

Graphite on off-white wove paper