By using 20 individual faces and combining them into a mosaic the author was able to create one almost perfect big face. This mosaic illusion is one of the most impressive optical illusions I have ever seen.

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Captcha is an acronym for Completely Automated Public Turing test to tell Computers and Humans Apart, it protects websites from spam bots by generating and grading tests that humans can pass but computer programs can't.
This is a collection of funniest and craziest captchas found on the Internet.

So let's start with the funniest captchas out there:

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Amazing drawings that give you a very cool illusion when you reverse them. It's the completely same image flipped upside down but the image you see is something totally different.

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As you can see in these pictures, if you find a suitable album cover and hold it in front of you correctly you will be able to create a cool optical illusion. These albums were placed in a perfect position with the figure of the people holding them so they appear transparent and in some examples real.

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Pictures of awesome caricatures side by side with the person on them taken at El Paso Fair in Texas.

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