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

Graphite with green, yellow and brown on paper

Green colored pencil and gray crayon on paper

Black and aqua marker on paper

Black marker on paper

Colored marker on paper

Colored marker and opaque watercolor on paper

Colored marker on paper

Black crayon on paper

Ink and graphite on paper

Colored crayons on paper

Colored marker on paper

Black marker on paper