The Greeks designed by a modulus of fixed measure, and that modulus, for the Doric order, was the distance between centers of the triglyphs. ...The t… - Ernest Flagg

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The Greeks designed by a modulus of fixed measure, and that modulus, for the Doric order, was the distance between centers of the triglyphs. ...The triglyphs stand in the frieze, at the corners of the building and at regular intervals at all sides of it; between then are panels, called metopæ, which are always square. The distance between the triglyphs, therefore, determines the height of the frieze. The height of the frieze determines that of the architrave, which is the same. The distance between the triglyphs also determines the spacing of the columns, for except at the corners of the building the center of each column coincides with that of every second triglyph. Upon the spacing of the triglyphs, therefore, depend absolutely the proportions of plan and order. That spacing constitutes a fixed modulus for the entire design which never varies in its application and is, in fact, the harmonic scale of the monument.