Actually not a ball at all, this is a bunch of photons projected onto
a flat 'screen', using dispersion.  Not very realistic (high
dispersion/low dispersion_samples) but pretty nontheless (I think)

Render time was around 11mins on my 1.4ghz Athlon, with +A0.1 +AM2
(approx 8.5 million stored photons)

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