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

Graphite on buff wove paper

Charcoal on brown wove paper

Transparent and opaque watercolor on off-white wove paper

Watercolor on off-white wove paper

Black ink on orange wove paper with postage stamp

Watercolor and black ink on white laid paper

Watercolor on heavy off-white wove paper

Charcoal on paper

Charcoal on cream laid paper

Graphite wash, black crayon, and graphite on off-white wove paper

Silverpoint and Italian white marble heightening on off-white modern wove paper, prepared with bohemian terre verte, lead white, calcined bone, and rabbit skin glue

Graphite on paper