How did I do it? Well, i placed the shells on a glass bottom, then put the glass on top of the light (bulb) and just shot! Unsharp Mask, sharpen, and resize, thats about it!
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Lawl.
This is contre-jour according to the instructional text next to the challenge name.
All they said was "Camera pointing towards or roughly towards the main light source."
Looks good to me.
People are crazy.
=(