Test render from a macro that parses an image file.  It divides the image
into whatever dimensions the user specifies (w*h), then samples each point
in the image.  I had it make a cube of the same color as the test points for
this image.  You can't really decipher what the first one is without
standing back a bit, kind of like the Dali image with the Abe Lincoln bust
in it.  I wrote a couple more... will post examples if I get time later.

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