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Architecture depends on Order, Arrangement, Eurythmy, Symmetry , Propriety , and Economy.
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A harmonious design requires that nothing be added or taken away.
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In accordance with the foregoing investigations on mathematical principles, let bronze vessels be made, proportionate to the size of the theatre, and let them be so fashioned that, when touched, they may produce with one another the notes of the fourth, the fifth, and so on up the double octave.
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Architects should be educated, skillful with the pencil, instructed in geometry, know much history, have followed the philosophers with attention, understand music, have some knowledge of medicine, know the opinions of the jurists, and be acquainted with astronomy and the theory of the heavens
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Architect's designs must refer to the unquestionable perfection of the body's symmetry and proportions. If a building is to create a sense of eurythmia, it is essential that it mirrors these natural laws of harmony and beauty
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If our designs for private houses are to be correct, we must at the outset take note of the countries and climates in which they are built.
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The architect must not only understand drawing, but music.
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Nothing requires the architect's care more than the due proportions of buildings.
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It is no secret that the moon has no light of her own, but is, as it were, a mirror, receiving brightness from the influence of the sun.
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Beauty is produced by the pleasing appearance and good taste of the whole, and by the dimensions of all the parts being duly proportioned to each other.
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The [engineer] should be equipped with knowledge of many branches of study and varied kinds of learning, for it is by his judgement that all work done by the other arts is put to test. This knowledge is the child of practice and theory.