Sorting out light

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Science  27 Mar 2015:
Vol. 347, Issue 6229, pp. 1423-1424
DOI: 10.1126/science.aaa6801

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When light beams become mixed up, can we sort them out again? Some cases are easy. The light from two flashlights on the other side of a room overlaps when it reaches us, but the lens in our eye separates them again as it constructs an image. By turning the flashlights on and off, we could also communicate two independent, spatial channels of information to different detectors at the back of our eyes.