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Nokia researchers in Tampere, Finland have created an interactive touch-screen on blocks of ice. The surface of the ice is melted with a heat gun, then an infra-red light is projected onto the ice so that when the surface is touched by human hands, the light is reflected back off them and colours appear on the ice. A computer tracks the movement to create interesting light patterns. This is potentially a new way for brands to advertise in cold climates.
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