How to use the Mirror of Loss in Baldur's Gate 3

The Mirror of Loss is one of the more confusing parts of Baldur's Gate 3's Gauntlet of Shar. Like me, you probably spent far too long exploring the room, turning candles off and on, before giving up and abandoning the broken mirror. The good news is that there's another Mirror of Loss in Act 3 and you can actually interact with this one properly...
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