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They invented ways of using the orders not merely as ornamental enrichments for their new types of structure but as controls. The orders are, in many Roman buildings, quite useless structurally but they make their buildings expressive, they make them speak; they conduct the building, with sense and ceremony and often with great elegance, into the mind of the beholder. Visually, they dominate and control the buildings to which they are attached. 

highlight: "control"