At night, the blind man is walking in the street with a small gong. What happened?

The sound of clang, clang and clang sounded in the alley, and the barking of dogs in the alley followed the sound of gongs. At the end, a man came out with a small gong, and he couldn't tell his age. He walked slowly, slowly. Judging from his appearance, it turned out that he was Chen, a blind fortune teller by the bridge, and in the distance, I thought he was an ancient night watchman. I sat at the door watching and stopped my aunt's dog next door.