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    Cool! I wonder if you could have more than one image encoded by focusing the caustics at different distances from window.

    I wonder if you could get a colour image?

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      This is fabulous. I didn’t follow all the math but I’m guessing at some point, especially for the hologram, the author had to solve a complex coupled system to arrive at the surface.

      Similar, but perhaps not so complex to solve, is the digital sundial: http://www.mojoptix.com/2015/10/25/mojoptix-001-digital-sundial/

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        Well you see, I’ve discovered a truly marvelous proof of this, which this website’s margin is unfortunately too narrow to contain :)

        Change your stylesheet, then! ;-)

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          Only 350 years will tell!