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

Watercolor over graphite on off-white illustration board

Graphite and marker on graph paper

Graphite on blue toned gesso prepared wove paper

Brown ink and green crayon on off-white wove paper, mounted to wove paper

Ink wash, black chalk, graphite, and white gouache on cream laid paper

Watercolor and graphite on cream wove paper

Transparent and opaque watercolor and graphite on off-white wove paper

Graphite on gesso prepared off-white wove paper

Graphite on paper

Graphite on off-white wove paper

Graphite on off-white tracing paper

Graphite on blue laid paper