>> Clearly in this universe, something is fatally wrong with the laws of
>> reflection. o_O
>
> Bah. Damned sign conventions...

Incidentally, this is exactly the sort of thing that it's really hard to 
think up test cases for. I mean, if you build a ray tracer, and your 
spheres render inside-out, what have you done wrong? Is there a typo in 
your vector arithmetic? Have you got the direction of a ray backwards 
somewhere? Is there a glitch in your camera implementation? It's really 
hard to know where to start. And it's really hard to come up with actual 
test cases other than "make it render something and see if the result 
looks plausible"...

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