What is this "special candle" I saw on PBS?

V-Ronkz

New member
I was watching Ciao Italia and saw at the end of the show, the host's guest made this "special birthday candle" that was like a hollow wax paper cylinder or something (I'm not sure). You would light the top of it, and it would burn down to the bottom, and when it did, all the left over carbon was like a hot air balloon and floated up into the air, then the guy caught it in the palm of his hand. Does anyone know what these are called and/or how to make them?
 
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