Michael Foucault's Of Other Spaces He says that the great obsession of the nineteenth century was, as we know, history: with its themes of development and of suspension, of crisis, and cycle, themes of the ever-accumulating past, with its great preponderance of dead men and the menacing glaciation of the world. Then the turn to space, which he argues, has a history.

One could say, by way of retracing this history of space very roughly, that in the Middle Ages there was a hierarchic ensemble of places: sacred places and profane plates: protected places and open, exposed places: urban places and rural places (all these concern the real life of men). In cosmological theory, there were the supercelestial places as opposed to the celestial, and the celestial place was in its turn opposed to the terrestrial place. There were places where things had been put because they had been violently displaced, and then on the contrary places where things found their natural ground and stability. It was this complete hierarchy, this opposition, this intersection of places that constituted what could very roughly be called medieval space: the space of emplacement.

This space of emplacement was opened up by Galileo. For the real scandal of Galileo's work lay not so much in his discovery, or rediscovery, that the earth revolved around the sun, but in his constitution of an infinite, and infinitely open space. In such a space the place of the Middle Ages turned out to be dissolved. as it were; a thing's place was no longer anything but a point in its movement, just as the stability of a thing was only its movement indefinitely slowed down. In other words, starting with Galileo and the seventeenth century, extension was substituted for localization.

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