Hmm... I ran the render again with max_trace_level at 25, for both rays and
photons, and with photons spacing set to one-half the previous value (0.01)
on Maurice's suggestion - I believe that increases the photon count, please
correct me if I'm wrong? Still the same artifacts...

In response to Slime, there are no isosurfaces in the image, only tori (and
one plane and one off-camera sphere).

Does anyone have any other suggestions?

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