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This one is a classic visual illusion. No need to introduce.
classic
There should be 11 faces on this picture. Average people see 4-6, sensible 8-10. The best see all 11, schizophrenics and paranoics 12 and more. And you? (don't take this one too seriously)
11 faces
Do you see some squares or rectangles? Really, this is nothing more than a bunch of lines going in every which direction, but the way our mind interprets these lines are totally different!
lines4
A nice visual illusion using perfect squares.
squares
Perfect squares one more time.squares
A perfect circle. (来源：英语分类信息 http://fl.englishcn.com)
circle
At first glance, what do you see. Could it be the word "liar" or is it something more. I would definitely give this one a second look!
liar
When you first look at this, how many colours do you see? Some might say they see 3 or even 4 colours, but there are 2 - red and green! People usually think they see 2 shades of red, but there is only 1. Look closely and you will notice on one side that white boxes surround the red boxes, and on the other side, green boxes do! Due to the placement of these boxes you get the "illusion" of different colours. Since white is not considered to be a colour (it is the presence of all colours in scientific terms) we can safely say that there are 2 colours present here! Still don't understand?
red-green
And as I began, the same way I end.
(来源：EnglishCN英语问答中心[e问e答])

Ms. or Mrs. 2

from : hlavolamy.szm.sk