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In page Parthenon:

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The close measurement of the Parthenon in the nineteenth century revealed that the temple deviated from strict rectilinearity through several optical refinements.[note 1] First, the stylobate is curved, bulging upward at the centre—by 10.3 cm over 70 m (a 1/700 ratio)—with a corresponding curvature in the entablature, visible as a slight ridge on the capitals.[1] Second, the columns exhibit entasis, i.e., swelling that reduces toward the top, a practice in use by mid-6th century[2] but in Parthenon the effect is subtler with a ratio of 1/550 to 1/600. Third, both the columns and naos walls incline slightly inward. Fourth, the corner columns are slightly displaced.[citation needed]