The two cities, or perceptions of the cities, show how different perceptions can create different environments. The residents of zeitgeist and nostalgia live in the same city. It is their perceptions and viewpoints that differentiate between the two cities, these two conditions cannot exist in isolation.

The bridge does not act in the conventional way, but as there is only one city a conventional bridge should not be required. By only touching one shore the bridge does not reject any one of the two viewpoints. It is because the structure only touches one shore that the bridge can serve as a paradigm of the idea that the past and future are always present within one and any city and that there can be no one city that exists solely on a single perception.
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Architecture, Engineering, Philosophy