The lecture by Caledonia remind me a word from Mamoru Oshii： City is an external memory device of human. And this memory is not only showed to this citizen, but also showed to and transformed by Aliens, outsiders. The city itself is like a installation, or even a metaphor.
The urban space(including street, housing, square, etc) is not only a place for human activity, its also shows how individual is refused or alienated in the society.
Kowloon Walled City was a Slum in Hongkong.(its already be destroyed). The formation of this Slum is affected by very complicated history factor.Most of the residents lived there are illegal.