The Identicast is a machine for building up an approximate picture of a suspect – or of someone who has perhaps only been glimpsed in a street or a train or in a passing car. It works on the magic lantern principle. The operator flashes on the screen various head-shapes and sizes. When one is recognized it stays on the screen. Then various haircuts are shown, and then all the other features follow and are chosen one by one – different shapes of eyes, noses, chins, mouths, eyebrows, cheeks, ears. In the end there is the whole picture of a face, as near as the scanner can remember it, and it is
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