"Haus Sonnenfang" Sanatorium, Berlin, 1931: Roof plan, 1:500

Colored marker on paper

Colored crayons on paper

Black marker on paper

Graphite and colored pencil on paper

Black and colored crayon on off-white wove paper

Charcoal on cream wove paper

Colored marker on paper

Graphite on paper and mounted

Black crayon on paper

Black ink, partly over graphite, on cream laid paper.

Graphite on paper

Black crayon on paper