WattsOSHPHawk Protecting Endangered Forest1986 · Watercolor and pastel on paper38 × 49 1/2 in. (96.5 × 125.7 cm)The Metropolitan Museum of Art
WattsOSDRDye Reaction1970 · Ink on photosensitived paper7 7/8 x 7 3/4" (20 x 19.8 cm)Museum of Modern Art
WattsOSLOLandscape of the Earth1969 · Resin and charcoal on canvas60 × 72 in. (152.4 × 182.9 cm)The Metropolitan Museum of Art
Circumference of Beech Tree1969 · Five gelatin silver printsEach 19 × 12 1/2" (48.3 × 31.8 cm)Museum of Modern Art
WattsOSEMEarth Monument to New York1969 · Wood, stone, earth, plastic, and oil-based paint, in three parts6' x 31 1/2" x 3 3/4" (182.9 x 80 x 9.5 cm)Museum of Modern Art
WattsOSLOLandscape of the Sky1968 · Resin and charcoal on canvas72 × 60 1/4 in. (182.9 × 153 cm)The Metropolitan Museum of Art
Aging Tree 21968 · Chromogenic print, leaves, and oil on canvas106.7 × 71.6 cm (42 × 28 3/16 in.)Art Institute of Chicago
Aging Tree 11968 · Chromogenic print, leaves, and oil on canvas106.7 × 71.1 cm (42 × 82 in.)Art Institute of Chicago