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

Ink on paper

Graphite on paper

Graphite and blue ink on paper

Black crayon on paper

Colored marker on paper

Black marker on paper

Colored crayon on paper

Black crayon on tan wove paper

Black, green, and blue crayon on paper

Graphite and colored pencil on paper

Graphite on paper

Black crayon on paper