Why is the street lamp a light arc when you look through the window at night?

This is a kind of "visual persistence" effect. People's eyes look at the object, the object disappears, and there is still an image in your feeling 0. 16 seconds. The movie is shown at the speed of 24 frames per second, and your "visual persistence" is used to deceive your visual nerve and form a moving picture. If there is no visual persistence, the street lamp you see will always be that one. Watching a movie is a different picture from frame to frame.