At the bottom of the cave, there is a circular hole above, where you can see the sky and let the sunlight shine down. The chamber beneath the cave is surrounded by glass. There are glowing LED lights at the edges of the room. Residents dress fashionably, carry bags, chat and shop. Some trees with small roots grow on the cave wall, and some decorative lights hang on the cave wall. There are three floors in the cave, each with a different architectural style. The simple design building on the first floor has white lights, the sci-fi style building on the second floor has complex colorful lights, and the retro Japanese-style building on the third floor has yellow lights and thin running water on the roadside.