Many of you have probably seen this at slashdot,

Here is a physical technique to interchange the roles of a camera and a
light-source which is reminds me of how POV-Ray calculates the rays.

See the (maybe slashdotted) page:
http://graphics.stanford.edu/papers/dual_photography/

download the 60MB movie and marvel at the card-trick at the end.

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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