The navigation is our property RENE: Tell me what we have. Of value. GAEL: Whatever we've bought in cargo so far. I don't know what you want me— RENE: Anyone can buy goods. What do we really have? What do we sell? GAEL (realizing): The route. RENE: Yes. The navigation is our property. To copy a man's route is to steal it. Shane Carruth, The Modern Ocean Into the system of flight navigationownership
The axis of movement Moving in the city means constantly changing the axis of movement. In general, lateral movement is confined to a single plane, what’s called grade, the ground level. Because circulation in multistory buildings is fundamentally one way—which is to say from the bottom up—the condition at the top is invariably different from that at the bottom. Rooftop circulation is the domain of Fantômas, of cat burglars and fleeing criminals, of lovers, and of those acrobatic enough to negotiate the gaps between buildings. Michael Sorkin, 20 Minutes in Manhattan A Burglar's Guide to the City movement