1916
45.3 x 31.8 cm (17 13/16 x 12 1/2 in.)
Watercolor on white wove paper
20th centurySwissGraphite, bitumen, and gouache on off-white wove paper
20th centurySwissRed ink on off-white Japanese paper
20th centurySwissInvisible physical energy on white wove paper. [The actual drawing is a blank sheet of wove paper placed into a handmade glassine envelope which is itself placed into a handmade white wove paper envelope which is then placed into a handmade brown card folder. There is also another handmade glassine envelope which contains a white printed card. The text on the latter reads: "A Couple of Wet Rocks/(invisible drawing/energy)"]
20th centurySwissGraphite on off-white paper
19th-20th centurySwissGraphite and colored pencils on architect's tracing paper
20th centurySwissAcrylic paint on paper
20th centurySwissOil paint and graphite over gesso on paper mounted on board
20th centurySwissWatercolor and gouache on cream wove paper
20th centurySwissBlack ink over graphite on cream wove paper
20th centurySwissBlack ink on off-white wove paper
20th centurySwissCharcoal on tan wove paper
20th centurySwiss