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

Graphite on paper

Graphite on paper

Graphite on paper and mounted

Black and blue pen on paper

Graphite on tan wove paper

Graphite on paper

Black crayon on off-white wove paper

Brown crayon on paper

Colored marker on paper

Graphite and colored pencil on paper

Graphite on paper

Graphite on paper