Study of a skyscraper: elevations and plan; verso: Building design

Colored marker and red pen on paper

Black and red marker on paper

Blue marker and black pen on paper

Graphite and colored pencil on cream wove paper

Colored marker and black pen on paper

Red marker on paper

Colored marker on paper

Ink on paper

Black ink and charcoal on cream laid paper

Mixed media

Black crayon on paper

Graphite on paper