you are talking nonsense, what has physics got do so with it.
Sorry to say, but your room isn’t that dark.
This is my room - absolute black hole black - taken from my seating position
View attachment 1382375
and this is zoomed out to show all of my walls and ceilings
View attachment 1382376
You say it’s not possible to have a floating screen effect on a PJ. It is!
If you don’t believe me I can point you to around 15 people who have seen my room and will testify how dark it is. I know you know
@Gordon @ Convergent AV , ask him, he’ll tell you.
I see you’ve edited your previous post, showing a complete black image being projected. Ok, in this rare instance where I have a logo menu up, or maybe a space shot with stars, then yes I can see your point, although even then, it still does look like a floating screen with lesser blacks being projected within an abyss of black space.