> What you get with rand is a series of random numbers. Using the same 
> seed the series is always the same.

That's an intentional design feature, if you place a bunch of objects
randomly with a certain seed, the image should still be exactly
reproducable on any machine running POV. Also, if you are
unhappy with the way a random placement pattern looks, you 
can try another seed until you are happy with the placement, 
and then be able to reproduce that same pattern in a final scene 
with slower features like radiosity and photons turned on.

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