Veja em http://goo.gl/5DMvGp a animação de um sinal de STOP projetado em um cortina de minúsculos pinguinhos d'água,...

Veja em http://goo.gl/5DMvGp a animação de um sinal de STOP projetado em um cortina de minúsculos pinguinhos d'água, em um túnel em Sydney, na Austrália.

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Originally shared by Andres M. Trianon

Sydney Harbor Tunnel: Water Curtain Road signs.
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The system creates the illusion of a solid surface that instantly blocks both lanes of traffic. The Softstop Barrier System produces a pseudo holographic image that appears to float in mid air, commanding the attention of the motorist making the 'STOP' message impossible to miss
http://www.truckinginfo.com/blog/on-the-road/story/2013/05/aussies-deploy-water-wall-tunnel-warning-technology.aspx

http://i.imgur.com/s5zN6o0.gif