holes15 x 12 x 12 inchesoil on wood (Celtis occidentalis)
sky32 x 12 x 11 inchesoil on wood (Ulmus rubra)
pipes36 x 17 x 14 incheswood (Ulmus rubra), copper, brass, steel
clouds23 ½ x 12 x 10 inchesoil on wood (Maclura pomifera)