Input text: a [wall] backdrop. a window. a big gray person is 3 feet in front of and left of and -2 feet beneath the window. the person faces the window. a large gray sofa is 3 feet behind the person. a enormous gray plant is left of the sofa. its stem is gray. its leaf is gray. its vase is gray. sky is 2000 foot wide [rainbow]. a gigantic bird is 30 feet in front of and -4 feet right of and -4 feet above the window. it faces back. a light is in front of the person. shadow plane.