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

Ink, graphite and colored crayons on paper

Blue pen and red felt-tipped pen

Ink and wash on paper

Colored marker and watercolor on paper

Graphite on paper

Ink and applied typescript on paper

Colored marker on paper

Colored marker and black pen on paper

Ink and colored washes on paper, spatter-painted

Graphite on paper

Graphite on paper

Colored marker on paper