What happened when UFOs appeared in the air twice and a building flew into the sky like a rocket? Is there any explanation for this?

When talking about why two surreal scenes should be added to the film, Jia said, "The ancient city of two thousand years disappeared in just two years, just like magic." This sentence was also said by an official of the demolition office in the town in the movie ... The director's subtext is that the biggest "surrealism" is our numb reality.

The idea of flying saucer came to Jia suddenly by the Three Gorges River. If there were flying saucers, what would aliens think of these fragile earthlings? How to treat this huge "Pinghu out of the high gorge"? As for the flying tower, it was originally a memorial tower for immigrants, but the construction stopped in the middle. This is a building that the director should not have, so he let it fly away.

I think the director's idea is lovely. This film is full of people who are confused and live in the cracks. They all prayed for happiness carefully like tightrope. Even if they are in danger and lost, it is always good to miss them. In addition, UFO is not a head-up view, but a higher level. In that position, what kind of ecology will all beings be?