Watch the above video. Not only does your mind misinterpret what it sees in the foreground, it doesn’t seem to understand what’s going on in the mirror image in the background. This misunderstanding takes place because 1) the brain can’t accurately render depth from a single vantage point (i.e. a video) and 2) the brain likes to “see” right angles (the kind that would occur should the curve of the roof continue—it would meet a plane perpendicular to the axis of the roof).