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The illusion is perhaps related to the Müller-Lyer
illusion, when two lines of equal length appear different because of
arrow lines that point inward at the ends of one line and outward at
the ends of the other. In our illusion the coins' rims play the role
of the arrows. With distance AB the rims of the respective coins lay
within the length of AB. While for distance CD the rims are outside
its length. As a result this makes an illusion that distance AB seems
to be somewhat shorter than distance CD, though they are in fact
equal.
And as it can be seen the interactive version of this illusion works
the same way as the physical one - when you slide the coin it is
almost always that you stop sliding it when distances AB and CD are
still different enough. |
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