Order gives due measure to the members of a work considered separately, and symmetrical agreement to the proportions of the whole. It is an adjustmen… - Vitruvius

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Order gives due measure to the members of a work considered separately, and symmetrical agreement to the proportions of the whole. It is an adjustment according to quantity. By this I mean the selection of modules from the members of the work itself and, starting from these individual parts of members, constructing the whole work to correspond.