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An Anti-Abuse Ad With A Secret Message Only Children Can See

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http://techcrunch.com –   In order to discreetly reach abused children, one aid organization designed a clever billboard that only displays a hotline number for people shorter than 4’5″. The secret is a precisely serrated surface, a Lenticular lens, that reflects light differently to those looking from above and below a specified height. Shorter people (children) see the following message on a street sign: “If somebody hurts you, phone us and we’ll help you,” along with a confidential number to call the Spanish organization, Aid to Children and Adolescents. Adults see, “Sometime (IT news)