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

Etched, inked, and gummed offset plate with drawing and paint on zinc plate

White gouache, black ink, colored pencil, and graphite on green prepared wove paper

Collage of colored crayons, graphite, fabric, map, and masking tape

Watercolor and white gouache over graphite on heavy blue wove paper

Black ink and watercolor on thin cream wove paper; verso: watercolor and crayon

Charcoal on off-white laid paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Transparent and opaque watercolor and graphite on white wove paper

Watercolor and graphite on off-white wove paper

Graphite on heavy weight, white card stock (Strathmore Bristol board)

Watercolor and white gouache over graphite on buff laid paper