"Haus Sonnenfang" Sanatorium, Berlin, 1931: Sketch of ground floor plan

Ink and applied type on paper

Black pen on paper

Colored marker and black pen on paper

Black marker on paper

Blue marker and black ink on paper

Graphite on paper

Graphite on paper

Graphite on paper

Paper

Graphite and blue crayon on paper

Colored marker on paper

Ink on paper