These are some of the photos Gao Yuan has taken for tourists. [Photo/VCG]

Gao's complex

Gao Yuan got his photographer job at Tian'anmen Square in 1979. He said at first he did it because he made good money, but now he keeps at it because his love for the work and his responsibility keep him going on.

"I have dozens of elderly friends in my WeChat. They come to Tian'anmen Square to take photographs almost every year. I'm happy they always come to me to get their photo taken," Gao said.

"I don't think I'm only a photographer. I'm also a recorder - I show the changes in our times," he said.