Research Project on Economical Apartment Design, 1930: Building type IIIb: foundation plan, 1:50

Watercolor on paper

Graphite on paper

Graphite and watercolor on paper

Black marker and blue pen on paper

Black and colored inks on paper

Black ink and watercolor on beige laid paper

Dark blue crayon on paper

Colored marker on paper

Colored marker on paper

Black ink on translucent vellum paper

Graphite on paper

Graphite on paper