The glasses... could be pulled with thin needle or wire, or pushed from under the table. The candle... probably with some kind of automatic equipment under the candles or some mechanism that makes the candles light up when they were being covered up by the glass (or is it plastic?). Maybe when the carbon inside it mixed up with something-something chemical that has been planted on the candles or the air, then again, the cap upper side is not covered... Hmmm.
I dunno, my brain gives up.