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A recently identified visual illusion takes advantage of the unsettling effect of uncertainty in gaze direction. The “ghostly gaze” illusion, created by Rob Jenkins of the University of Glasgow in Scotland, was awarded second prize in the 2008 Best Illusion of the Year Contest, held in Naples, Fla. In this illusion (left and center), twin sisters appear to look at each other when seen from afar. But as you approach them, you realize that the sisters are looking directly at you!