Mirror tiles would be a quick and easy, but not so classy way of doing it, since they'll adhere to the root quite happily.
(Mind you, I'm not sure there is a classy way to do this...)
Otherwise, as was suggested upthread, a framed mirror is the best bet, since you can anchor the frame. Make sure the frame is anchored to beams, not plaster.
If you aren't experienced with this sort of thing, it's best finding someone who is; a big pile of glass landing on you in the middle of the night would be less than pleasant.
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