I believe the phong highlights in POV-Ray has a bug.

When you have a reflective object with a heavy normal then some of the
reflected rays would actually go *inside* the object, but luckily POV-Ray
prevents this some way.
Unfortunately POV-Ray doesn't prevent it with phong highlights, i.e. the
surface *can* "reflect" a light_source which is behind or inside the object.
I think POV-Ray should prevent it like it does with reflection.

Greetings,

Rune S. Johansen

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