I just lit a stick of incense. I observed that before the flame snuffed out, it consisted both of a vertical and a thinner horizontal flame. The horizontal flame was exactly perpendicular to the vertical one. It kept to a straight line and did not rise at all. Before I could photograph the flame, it went out. I found this bizarre, since I have never seen or heard of a horizontal flame, nor could think of anything that could cause a flame to behave in such way. I'm curious what mechanism could explain this phenomenon.