Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Sketch

Watercolor, white gouache and graphite on off-white cardboard

Colored crayons on paper

Charcoal on blue laid paper

Graphite on paper

Crayon on paper

Watercolor and graphite on white wove paper

Watercolor and white gouache on cream wove paper

Watercolor and graphite on off-white wove paper

Black ink on off-white wove paper

Colored crayons on paper

Graphite on off-white wove paper

Graphite on paper