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

Watercolor and brown and black ink on off-white wove paper

Brown wash and white gouache over graphite on blue wove paper

Graphite on paper

Graphite on paper

Black ink and gray wash on tan wove paper

Brown ink and wash over graphite on off-white wove paper; verso: brown ink

Graphite on paper

Black ink and gray wash on tan wove paper

Black ink on off-white wove paper

Black ink on thin off-white wove paper

Black ink, blue crayon, white-out and touches of red ink on pink squared wove paper

Watercolor over graphite on cream card