Untitled (bleed-through of previous page and color transfer, left page); Untitled (design for "Meeresobjekte," right page)

Watercolor and gouache on off-white wove paper

Black and red pen, paper, opaque watercolor, metallic marker, and adhesive on paper

Graphite on buff wove paper

Graphite on paper

Black chalk on cream modern laid paper

Casein on paper (graphite underdrawing?)

Black marker and tape on paper

Brown ink on cream antique laid paper

Watercolor over graphite on white wove paper

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

Graphite on gesso prepared off-white wove paper