|Their story begins on ground level, with footsteps. They are myriad, but do not compose a series. They cannot be counted because each unit has a qualitative character: a style of tactile apprehension and kinesthetic appropriation. Their swarming mass is an innumerable collection of singularities. Their intertwined paths give their shape to the city. In that respect, pedestrian movements form one of these "real systems whose existence in fact makes up the city". They weave places together. They are not localized; it is rather they that spatialize. ... The act of walking is to the urban system what the speech act is to the language.|
Michel De Certeau, from The Practise of Everyday Life.