Everything about The Sander Illusion totally explained
The
Sander illusion or
Sander's parallelogram is an
optical illusion described by the German psychologist Friedrich Sander (1889-1971) in
1926. However, it had been published earlier by
Matthew Luckiesh in his 1922 book
Visual Illusions: Their Causes, Characteristics, and Applications
.
The diagonal
line bisecting the larger, left-hand
parallelogram appears to be considerably longer than the diagonal line bisecting the smaller, right-hand parallelogram, but is in fact the same length.
One possible reason for this illusion is that the diagonal lines around the blue lines give a perception of depth, and when the blue lines are included in that depth, they're perceived as different lengths.
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