I don’t know how many of you have seen 3D moving images; I went many years ago to the 3D showing at the IMAX theatre in New York. When you got into the theatre you donned a large, semi-comfortable headset that had an Infra Red sensor on the top of it. The theatre used this to control the speed on the shutters opening and closing over each eye, to ensure it synced with the film projection. The film didn’t feel that 3D until the shark came swimming into the theatre - gasps all round.
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