Doctor: It's camouflage. It's disguised as a police telephone box from 1963. Every time the TARDIS materializes at a new location, within the first nano-second of landing, it analyzes its surroundings, calculates a twelve dimensional data map of everything in a thousand mile radius, and determines which outer shell would blend in best with the environment.
Amy:
Doctor:
Amy:
Doctor:
Amy:
Doctor:
Amy:
Doctor:
Amy:
Doctor: And then it disguises itself as a police telephone box from 1963.
