Comment by Eric_WVGG

A few years ago I heard about a method of using bundles of fiberoptic cable to "pipe" sunlight from a rooftop into rooms. My impression is that it's cheap as hell but impractical.

I can't find the article, but this seems to refer to the same idea: https://www.quora.com/Can-fiber-optic-cables-be-used-to-carr...