Untitled (notes on alternatives to Feuerwerk, left page); Untitled (sketch for Kunstmuseum Celle, right page)

Colored marker and blue ink on paper

Red felt-tipped pen on paper

Colored marker on paper

Colored marker, black ink, and opaque watercolor on paper

Colored marker on paper

Colored marker and black ink on paper

Colored marker on paper

Mixed media

Colored marker and blue ink on paper

Colored marker on paper

Black marker on paper

Ink on postcard