Oh and I recommend a non-black sky because otherwise you never
know if your black areas are trace level artefacts, shadows
or some path in which the sky is visible:

sphere
{
   0, 1000 hollow pigment {color SkyBlue}
}

And before the usual suspects complain, yes, I'm perfectly
aware "hollow" has no effect here. But I do so dislike tracking
down strange issues later when media enters the scene ;)

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