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

Graphite on paper

Graphite on paper, mounted

Colored marker and black ink on paper

Black crayon on paper

Black crayon on paper

Colored marker on paper

Colored marker and black pen on paper

Pigment, paraffin on transparent paper

Black ink on cream laid paper

Graphite, charcoal, color pencil, wash on brown wove paper

Graphite and colored crayon on off-white wove paper

Paper