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In page Hippodamus of Miletus:

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The grid plans attributed to him consisted of series of broad, straight streets, cutting one another at right angles.[7] In Miletus we can find the prototype plan of Hippodamus. What is most impressive in his plan is a wide central area, which was kept unsettled according to his macro-scale urban prediction/estimation and in time evolved to the "Agora", the centre of both the city and the society.[citation needed]