"If you approach the book, the face recognition system picks up your face and starts scanning it for signs of “judgement”. If you’re over excited or your face shows a sceptical expression, the book will stay locked. But if your expression is neutral (no judgement) the system will send an audio-pulse to the Arduino and the book will unlock itself."
http://www.huffingtonpost.com/2015/02/02/judge-book-cover_n_6599574.html
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