"Haus Sonnenfang" Sanatorium, Berlin, 1931: First-fourth floor plan, 1:500

Black marker on paper

Graphite on paper

Colored marker on paper

Graphite on paper

Blue pen and pink marker on paper

Graphite on paper

Black crayon on gray modern laid paper

Colored marker and black pen on paper

Ink and wash on paper

Colored marker on paper

Graphite on paper

Colored marker on paper