Trying your example out here and I can't explain it. I looked at the scene
differently by moving the camera back outside of the dome. It really makes
for a better perspective I think. To do that, the "wall" must be commented
out. I can get both red and cyan showing in what appears a odd sort of way,
somethng about the light interaction/shadow. I'd never have expected both
colors to be present in a single color media, very unusual to me. Maybe
someone know of the reason for this but a color shift like this is
practically the stuff of wavelengths. To guess, might it be a
self-shadowing?

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