Optics principles. For example, the Ames room, Hering, Müller-Lyer, Orbison, Ponzo, Sander, and Wundt illusions all rely on the suggestion of the appearance of distance by using converging and diverging lines, in the same way that parallel light rays (or indeed any set of parallel lines) appear to converge at a vanishing point at infinity in two-dimensionally rendered images with artistic perspective. This suggestion is also responsible for the famous moon illusion where the moon, despite having essentially the same angular size, appears much larger near the horizon than it does at zenith. This illusion so confounded Ptolemy that he incorrectly
The Devil's Point easiest route is to follow the path leading up the Coire Odhar from Corrour Bothy, on the eastern side of the mountain. To reach the bothy requires a long walk in; the most usual route is to follow the Lairig Ghru from Linn of Dee, a distance of some . The Devil's Point is often climbed along with Cairn Toul. Sgòr an Lochain Uaine, which lies to the north of Cairn Toul is sometimes called "The Angel's Peak", in contrast to The Devil's Point. The Devil's Point The Devil's Point (Scottish Gaelic: Bod an Deamhain) is a mountain in the