I think maybe it’s all about from the perspective that the apple sees. to the human eye we see a room first, and then see the details, the first thing i saw when looking at this was the apple. it shows the perspective and the things we find more ‘important’ pop out to us first. So although it may seem strange the apple is the focal point.
It can enable you to change the scenery overlays and this is used as on diting tool for the X‑Plane flight simulator. You can manage the air traffic control flow and even change the output scenery and edit data files.
