Macbeth responds to the news of Lady Macbeth's suicide by proclaiming "out, out brief candle" (5.5.26), turning the candle's flame has become a metaphor for her short life and sudden death. Similarly, Banquo's torchlight (the one that illuminates him just enough so his murderers can see what they're doing) is also snuffed out the moment he's killed (3.3.27). And both of these incidents recall an event from the evening King Duncan is murdered —Lennox reports that the fire in his chimney was mysteriously "blown" out (2.3.63).
Straightforward, right? The one thing we're stuck on is that this whole play is about inversion: fair being foul, and foul being fair; men being women, women being men; and the whole regicide business. Are there any moments that make this dark/ light dichotomy more complex? Or is this one area where light is just light, and dark is just dark?