Fake window in a basement. They used different fake christmas trees to make it more believable.
We added a fake window in order to balance the room. We weren't allowed by the town to put a new window in, so we had one framed on the inside, and had light tubes installed inside the glass so it looks like daylight coming in! We added same blinds as the rest of the room. This would be great for a basement that doesn't have a window.