While most CAPTCHA tests we come across on the Web are usually meant to keep robots out, one website is welcoming them in. From a report: The conceit of Humans Not Invited is essentially a reverse CAPTCHA. Visitors to the site are greeted with a vision test not unlike the ones you've done before, but instead it's filled with seemingly indistinguishable blue and gray blurry boxes. When I tried, prompted to "select all squares with Selfie Sticks." Most humans, like me, will fail to decipher the hidden selfie sticks and will be shown a message that says "YOU'RE A Human. YOU'RE NOT INVITED." To the human eye these boxes appear indistinguishable, a specially programmed bot can spot out the correct image simply by identifying a handful of pixels, according to the project's creator, Damjanski, (his real name is Danjan Pita).

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