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I haven't seen anyone mention negative light sources. Or maybe I'm the only
one that thinks it's really cool. I haven't thought of a practical use of
this, aside from looking weird, but I'm sure you could do something with it.
camera {location <0, 5, 5> look_at <0, 0, 0>}
light_source {500, 1}
light_source {<-500, 500, 500>, 1}
light_source {<0, 500, -500>, -1}
sphere {0, 1 translate <0, 1, 0> pigment {rgb 1}}
cylinder {0, <0, -1, 0>, 30 pigment {rgb 1}}
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