Some candles are designed to burn hollow, so as to illumine from within. These would have to be fairly fat or wide - with a thinner wick than would melt to the edges of the candle.
Taller thinner candles will not burn hollow - mostly due to the chimney created will cause excess fluttering, which then causes the walls to melt wider and either overflow or drown.
As well as illuminating the candle's colour and design from within, a hollow burning candle will create a shell with a fascinating interior surface.
To successfully burn hollow a candle must first of all be of correct size and have the right wick.
It is also important to burn such a candle for longer periods. See Why might a candle drown in its own wax?
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