>   Now, this is interesting. For no apparent reason a quite chaotic pattern
> (with greenish-yellow coloration) has appeared seemingly from nowhere on
the
> sphere at the right of the central sphere.

I assume the sky is, as it appears, just a plain gradient without patterns
or turbulence.  What happens when you change the ground to just a flat,
plain colour?  If the pattern is still there, could you post a close-up?

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