Bahner Residence, Berlin, Klein-Machnow, 1933: Drainage system: detail sketches

Black crayon on paper

Black and colored inks on paper

Graphite and white wash on composition board

Colored marker on paper

Blue crayon on paper

Brown ink on cream paper; verso: black ink

Brown crayon on cream wove paper

Black marker on paper

Graphite on paper

Ink on paper

Ink and colored crayon on paper

Graphite on paper