Here we have three pictures of a bunch of pencils laying on a desk. At first glance they all look the same, but on second viewing you will notice that the lead in the large pencil on the left is different in each picture. So what's the illusion? Well, in one of these pictures the lead in the large pencil is the same size as the lead in all the smaller pencils. Can you tell in which one they are all the same?
Optical Illusion Website
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