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Message: <blockquote data-quote="Thilina Sandaruwan" data-source="post: 9138475" data-attributes="member: 131814">It’s a simple one. How many pencils are there? There are clearly seven… what, wait! Six? No.. So how many?<img src="http://de.acidcow.com/pics/20101102/25_great_optical_01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Can you tell which of these lines is longer? Test them with a ruler or a piece of paper -- you may be surprised.<img src="http://de.acidcow.com/pics/20101102/25_great_optical_04.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />As the small circles intersect with the large ones, we seem to see the outlines of a growing and shrinking square. But there is no "square" -- your brain is trying to visualize in terms of solid shapes, and fills in the blanks. <img src="http://de.acidcow.com/pics/20101102/25_great_optical_06.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />Look at the red dot for a while and gray stripes will disappear<img src="http://de.acidcow.com/pics/20101102/25_great_optical_08.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Although you don’t believe it, these lines are straight and parallel<img src="http://de.acidcow.com/pics/20101102/25_great_optical_09.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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