The top-view photo is actually older; you can see in the front-view photo that the flaps in the back have been cut off.
Tunnel books can be flattened for storage. Some of them have cover flaps — which I guess is why they're called "books", but I opted to leave this open. You can read more about tunnel books on Wikipedia.
The scene, for those of you who may not be familiar with the place, is inspired by the Kalsangi golf course and its view of Mt. Matutum.