The moon tilt illusion.
Besides the familiar moon illusion [e.g. Hershenson, 1989 The Moon Illusion (Hillsdale, NJ: Lawrence Erlbaum Associates)], wherein the moon appears bigger when it is close to the horizon, there is a less known illusion which causes the moon's illuminated side to appear turned away from the direction of the sun. An experiment documenting the effect is described, and a possible explanation is put forward.
Schölkopf
B
B
Max-Planck-Institut für biologische Kybernetik, Tübingen, Germany. bs@first.gmd.de
D015350:Contrast Sensitivity; D006801:Humans; D016081:Moon; D009903:Optical Illusions; D011581:Psychological Tests