The moon appears larger near the horizon than when directly overhead, which led a number of psychologists to propose a variety of theories. One particular theory by Holway and Boring suggested that the illusion was due to the fact that when the moon is on the horizon, the observer looked straight at it with eyes level, whereas when it was overhead, the observer had to elevate both his or her eyes and head to see it.In order to test this theory, an apparatus was built to present two artiĆÆ&no …
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