Excuse me, I didn't mean to give the impression that I thought it was a real CAPTCHA. Of course it's fake. Still pretty thought-provoking, though.

read: it is not an image generated by google's recaptcha service, but an art piece designed to convey and draw attention to the possibilities, and probabilities, of the recaptcha service.

It's not fake so much as satirical. You would have to be pretty gullible to believe that it is a real reCaptcha.