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

Graphite with blue, yellow and brown crayon on paper

Black crayon on paper

Colored marker and blue pen on paper

Watercolor on paper

Black crayon on paper

Black and blue crayon on paper

Watercolor, colored pencil, graphite, and pastel on off-white wove paper

Black crayon on paper

Black ink, stationery with letterhead, b/w photocopy, and adhesive on paper

Ink on paper

Black and aqua marker on paper

Blue and black marker on paper