6604(per km2) is Hong Kong’s population density. Population density is calculated on the basis of the overall area of Hong Kong. For example, Hong Kong has a total area of 1,100 square kilometers, but

the actual development area is only about 25%. According to this calculation, the population density is as high as 28,500 persons per square kilometer. For this issue, I want to use camera to show this crowed city. Actually, it is every single family in Hong Kong.