Losses and echo is very high in turns, however it works pretty well on straight lines. The quartz serves to reduce the "escape rate" of photons in turns, and the insulator absorbs photons that still manage to pass the quartz.
optics
phot
photon
transmission
Comments
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_Toby_Fox_: They sometimes do. Rarely. This design needs improvement, really.
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They dont get all the way through