Coin Distances

 

Explanation

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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.

 
Last Updated: June 11, 2005
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