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

Graphite on paper

Colored marker on paper

Black marker, paper, and adhesive on paper

Plant material and blue pen on paper

Black crayon on paper

Ink and gouache on paper

Graphite on paper

Graphite with colored pencil on paper

Graphite and colored pencil on paper

Reddish brown fiber-tip ink on paper

Ink on paper

B/w photocopy on red paper and adhesive on sketchbook paper