Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Penthouse floor plan, 1:100

Black ink on off-white wove paper

Black ink on cream wove paper

Charcoal on off-white laid paper

Red and white chalk on blue-gray laid paper

Red chalk and brown watercolor on tracing paper; verso: black chalk

Charcoal and colored chalk on off-white Japanese paper

Graphite on off-white wove paper

Sketchbook with cardboard covers and spiral wire binding

Graphite on off-white wove paper mounted to board

Black ink and yellow chalk on off-white wove paper; verso: black ink

Graphite on cream wove paper

Black chalk and charcoal on off-white laid paper