example of smooth surface in cities
"This is because the differences are not objective: it is possible to live striated on the deserts, steppes, or seas; it is possible to live smooth even in the cities, to be an urban nomad (for example, a stroll taken by Henry Miller in Clichy or Brooklyn is a nomadic transit in smooth space; he makes the city disgorge a patchwork, differentials of speed, delays and accelerations, changes in orientation, continuous variations ... The beatniks owe much to Miller, but they changed direction again, they put the space outside the cities to new use)". (p482)
Deleuze, Gilles, and Felix Guattari. A Thousand Plateaus: Capitalism and Schizophrenia. Translated by Brian Massumi. Minneapolis MN, London: University of Minnesota Press, 1987.