looks like a reflection in the window of the lights above the seats but hey, I’m sober so it might be a ufo.
Looks like a reflection of the interior ceiling lights...
It is a reflection of the panel ~ not just the lights ~ there are all sorts of designs but this is the idea http://us.123rf.com/400wm/400/400/siwasasil/siwasasil1210/siwasasil121000022/15597385-overhead-console-in-the-passenger-aircraft.jpg
I thought along the same lines as you. Perhaps it’s the reflection of the light in the window from across the aisle.