Why do people take pictures with cameras in Sanlitun?

Sanlitun is known as the haunt of hipsters, and there are many fashionable women, so some people take pictures of them with cameras, and some photographers engage in outdoor shooting activities there to take pictures of beautiful women and street scenes. There are many foreigners in Sanlitun, and there are often some large-scale activities in Sanlitun, so many people take pictures with cameras and mobile phones.