Keystone of an Arch, Frontal View and Profile; verso: Sketches of a Ground Plan and a Nude Male Figure

Graphite on mat board

Red and black crayon

Graphite on paper

Graphite on off-white wove paper

Colored marker and black pen on paper

Ink and opaque watercolor on paper

Graphite and blue crayon on paper

Black ink and applied type on paper

Colored marker on paper

Colored crayon on paper

Graphite on paper