As for the perfectly reflecting box. I seem to remember thinking about that in E&M class. For now, I'll say that you could, in this impossibel case, make a 'light battery'. I do seem to recall there being problems with beam injection and interference patterns and something doesn't work out quite right. i don't remember what it was but if I do, i'll post it here.
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And if you say to me tomorrow, oh what fun it all would be.
Then what's to stop us, pretty baby. But What Is And What Should Never Be.
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