The central spheres have the same size. You wouldn't say so because your perception is being influenced by the surrounding spheres. Also called the Titchener illusion. Just in case you were wondering : "Is that the same as the Titchener illusion" ? Yes !
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Some One - Wednesday 27 April 2011
No one - Wednesday 4 May 2011
me too it is plain to see
Ellie - Friday 13 May 2011
wow with out reading that i wouldnt of none to do that xx