During his residency in ZK/U, the first thing Mu had noticed was the blurred boundary between private and public. To live in a building located in a public park means the residents will need to react to different behaviors and movements from the park’s original use. Mu couldn’t stop to notice the architectural infrastructures of the park. For instance, the revolving door that supposed only to let people getting in yet broken so everyone can get 24/7 access to the park. The revolving door has turned into a dysfunctional symbol that only represents limitation but provides full access, which he believes is one of the examples of blurring boundaries between private and public. He has also spent a lot of time walking on the streets of Berlin while getting attracted by the aesthetics of infrastructures on the road, especially the industrial elements of architecture. Mu used some of the characters from his previous works to create a series of images of a city walker, in which the characters are free to move in different parts of Berlin, to interrogate the definition of the public in urban spaces