This popped up about a year ago - IIRC, they lay fiber-optic material
(rods/fibers - I don't recall teh size and suppose it doesn't matter all
that much) into the concrete while it's being poured.
I suppose one could also use glass rods. I thought about doing some garden
stuff like that, "solar-lighted sculpture-thingies and/or maybe a birdbath
with a solar LED under it (too many plans, too many plans...)
If you used thin fibers, wouldn't it be a bit like using fiberglass as part
of the matrix, except linear glass rather than random fibers...?
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