Among other things, Kenneth saw fit to write:

> So as I understand it, the more random-grain individual images that are
> averaged together (images from different users on different machines), the
> better and more accurate the scene becomes? That's fascinating.

That's how signal and noise in general work. The "real" image is the signal,
the grain is the noise. As you add samples (rendered images) the signal
intensity increases linearly with the number of samples N, while the noise
typically increases only with the square root of N (because its random
nature). So to reduce the relative intensity of the noise 10 times you'd
need 100 times more images.

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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