Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Color symbols for different floors

Charcoal on cream laid paper

Black ink on cream wove paper

Black ink, graphite, and yellow chalk on off-white wove paper

Crayon on paper

Watercolor over graphite on off-white wove paper

Watercolor on cream wove paper

Acrylic, graphite, and computer print-out on off-white wove paper

Black ink on off-white wove paper

Watercolor on off-white wove paper

Black ink and gray wash on cream laid paper, mounted to brown wove paper

Black ink on off-white wove paper

Graphite on off-white tracing paper