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

Black marker on paper

Charcoal on paper

Black and red marker on paper

Colored crayon on paper

Colored crayons on paper

Graphite on paper

Crayon on paper

Graphite on paper

Graphite on paper

Collage on cardboard

Black marker on paper

Colored marker on paper