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Optical Illusions


alphakazi

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Identical imagines :huh:

pisa-leaning-tower-optical-illusion.jpg

notice the one on the right looks as though it's leaning more

Here is a novel illusion that is as striking as it is simple. The two images of the Leaning Tower of Pisa are

identical, yet one has the impression that the tower on the right leans more, as if photographed from a

different angle. The reason for this is because the visual system treats the two images as if part of a single

scene. Normally, if two adjacent towers rise at the same angle, their image outlines converge as they recede

from view due to perspective, and this is taken into account by the visual system. So when confronted with

two towers whose corresponding outlines are parallel, the visual system assumes they must be diverging as

they rise from view, and this is what we see. The illusion is not restricted to towers photographed from

below, but works well with other scenes, such as railway tracks receding into the distance. What this illusion

reveals is less to do with perspective, but how the visual system tends to treat two side-by-side images as if

part of the same scene. However hard we try to think of the two photographs of the Leaning Tower as

separate, albeit identical images of the same object, our visual system regards them as the

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