Stop Motion Animation with Candles

Matt @ Make: Online spotted this animation made with tea candles by brusspup on YouTube. He writes:

Youtube user brusspup, known for his impressive illusions, created this amazing fire animation using a bunch of tea candles, a camera, and lots of time. It appears to be a stop motion animation video, but there are some clear signs that it’s not what it looks like- anyone want to explain how it was done?