Untitled (adhered sketch of "Neon Cube," left page); Untitled (adhered sketch of "Neon Cube," right page)

Black chalk on cream antique laid paper

Colored marker on paper

Black crayon on paper

Graphite and gray crayon on paper

Crayon

Colored crayons on paper

Graphite on paper

Watercolor on off-white wove paper

Black ink over graphite on off-white wove card

Black and white chalk on tan antique laid paper, laid down on a decorated mount

Oil paint on offset lithograph, 1989 edition of Flora de la Real Expedición Botánica del Nuevo Reino de Granada (1783-1810)

Colored marker on paper