"Haus Sonnenfang" Sanatorium, Berlin, 1931: Sketches of perspectives and plan

Graphite and blue pen on paper

Graphite and blue crayon on paper

Graphite on paper

Graphite on paper

Black ink on translucent vellum paper

Graphite on paper

Graphite and yellow ochre crayon on paper

Graphite on paper adhered to paper

Black marker on paper

Black marker on paper

Black crayon on paper

Black crayon on off-white wove paper