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my room is quite dark and I want to get more sunlight into it. I feel this is possible by some sort of mirrored reflector hung outside the window. there's a company called Especial from France https://www.espaciel.com/en/reflectors/9-window-reflector.html that makes what I'm thinking of. has anybody seen something to make this at home? or is it as simple as "mount a mirror outside your window dummy"