To explain: the walls/ windows/etc. have a slight blue tint to them. at only this angle, this 2-dimensional shape seems to appear, when it's just colors on the wall.
To explain: the walls/ windows/etc. have a slight blue tint to them. at only this angle, this 2-dimensional shape seems to appear, when it's just colors on the wall.
Without different angles it just looks like a photo effect.