You know, ancient philosophers had an exactly analogous problem with candle flames. A candle flame is obviously a thing. It's visible, tangibly real, persistent, has properties (hot, bright), and even has (on close examination) distinct component parts.
But its apprehension as a thing raised some questions. Most particularly, where did it go when you blew the candle out, and where did it come from when the spark was struck to light it up?
The answer they came up with was that elemental fire, which is what they theorized the candle flame is primarily made of, was not just a kind of substance. Like their other four elements, it was also a pervasive ambient presence. That presence was not so much a parallel plane of existence filled with fire; it was more like a direction of movement, emanating (in fire's case) from the south. In any case, lighting the candle brought the elemental fire making up the flame into visible manifestation. Blowing it out did not end the flame's existence; it merely dismissed it to its invisible ambient state.
If they were using our style of phrasings, they would have said that the candle flame is a fluctuation in the universal proto-fire field.