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

Charcoal on blue laid paper

Casein and black and blue crayon on off-white card

Watercolor, brown and blue ink, colored pencil, black chalk on off-white wove paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Ink on paper

Charcoal on cream laid paper

Graphite on white wove paper

Black ink on cream wove paper

Conté crayon, charcoal, graphite, and collaged paper on white wove paper

Red, blue, and white colored pencil on tracing paper

Graphite on off-white laid paper