What are some theories about the glass candles?

The funniest one that I have come across is one that says that "dragon glass" is "dragon poop". I guess when the dragons and especially fire worms are underground they eat sand which is heated up and turns to glass. Who knows? read more

The sorcerers of the Freehold could see across mountains, seas, and deserts with one of these glass candles. They could enter a man’s dreams and give him visions, and speak to one another half a world apart, seated before their candles." A Feast For Crows. In a way, these glass candles might be some sort of fire version of the weirwood net. read more

Marwyn said glass candles are dragon glass infused with the sorcery of fire and blood; somewhat tieing in with the forging of lightbringer. If a glass candle or glass candles are revealed to be the basis of lightbringer it would actually be one of the more obvious clues in the books. read more

We are not told exactly how it works, but I would imagine there is some kind of process to lighting the candle. read more