It could be a moon in the sky out the window. If it were small, and square.
It could be a window light in a building across the way. Though it’s late and oddly placed.
Reflections in windows, explain.
Bamboo lit from below looks as fancy rooftop party, illuminating the night with stillness.
Cities live out windows, illuminations and reflections come alive.
Barely needing imagination when shifting physics has in hand already.