The city is a living environment that emerged after the industrial revolution. Some scholars say that the main idea of city is "exchange". People trade frequently in a place where functions are relatively concentrated. In fact, the function of "communication" in the city is also prominent. The gathering of a large number of people from different places, rich and diverse economic and cultural activities can all promote exchanges. Even the urban environment itself releases messages about the history of the city and its status quo. For Shenzhen, what do its images, one of the communication media, tell us? Guests were invited to this Cool Chat to share how they interact with the city through images.