The trick my local bar uses is to put artificial lights behind a stained glass window. No matter what time you go in it looks like late afternoon, about an hour before sunset. Unless you have a watch or line of sight to the outer door when someone opens it, you can’t tell what time it is.
I’ve never seen behind the stained glass but am guessing they have warm light fluorescent bulbs (no heat) and something diffusing the light because it looks evenly distributed.
There are no windows on the outside of the building so it seems something you can set into a wall.
After a very long day playing poker, I walked into the Sky Ceiling area in the Venetian and had a really strong feeling that something was very wrong. (It was probably 2 AM, but the room is convincing enough to make it feel like late afternoon and the disconnect was strong enough that I had to leave the area.)
I’ve never seen behind the stained glass but am guessing they have warm light fluorescent bulbs (no heat) and something diffusing the light because it looks evenly distributed.
There are no windows on the outside of the building so it seems something you can set into a wall.