Some films are just impossibly difficult to write on, and this is definitely one of them. By combining multiple exposures of the streets and locales of China, the filmmakers attempt to reflect a country (or it's ghosts, at the very least) permanently in transition.
Hong Kong is halfway through its planned 40-year "One Country, Two Systems" phase while Taiwan has shifted hands constantly from the Imperial dynasty to the Japanese to the modern Chinese republic, its sovereignty still questioned by the mainland. The film captures this fleeting sense of existence and identity by superimposing images, blending in space and time into something resembling the collision of two parallel universes. Spectres of humans and cars and buildings stalk across the frames, defined by their impermanence, forming a picture of their homeland that's simultaneously China as well as Not China i.e. a familiar-yet-alien land of changing systems and evolving identities.