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16The astronomer and musician delight in similar proportions, for the positions of the stars, which are quartile and trine, answer to a fourth and fifth in harmony. The same analogy holds in that branch of geometry which the Greeks call λόγος ὀπτικὸς: indeed, throughout the whole range of art, there are many incidents common to all. Practice alone can lead to excellence in any one: that architect, therefore, is sufficiently educated, whose general knowledge enables him to give his opinion on any branch when required to do so.
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