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Aram Bartholl, Are you human?, 2009, installation and urban intervention, variable size
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CAPTCHA is the acronym for “Completely Automated Public Turing test to tell Computers and Humans Apart". Web-based services i.e. Yahoo require users to recognize and type a randomly generated series of letters or numbers. This test is designed to ensure that a web form is not being completed by the automatic scripts used by spammers. CAPTCHA Codes are publicly available, and each code is uniquely generated by a computer program which "knows" the correct response, although it can not itself "read" the code.
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