M. Vitruvii Pollonis de architectura libri decem ad Caesarem Augustum omnibus omnium editionibus longe emendatiores collatis veteribus exemplis

...ornaments are often designed by architects in their works, about which they must provide a reason to those who ask why they did so. Just as if someone were to set up marble statues of women wearing stoles, which are called Caryatids, instead of columns in a work, and were to place mutules and cornices above them, he will provide the reason to those who ask in this way: Carya, a city of the Peloponnese, conspired with the Persians, the enemies of the Greeks. Later, the Greeks, gloriously liberated from the war by victory, declared war on the Caryatids by common counsel. Thus, the town having been captured, the men killed, and the city destroyed, they took their matrons into servitude. They did not allow them to lay aside their stoles or their matronal ornaments, so that they would not be led in one triumph, but that, burdened by heavy insult as an eternal example of servitude, they might seem to pay the penalty for the city. Therefore, the architects who were there at that time designed images of them for public buildings, placed as if bearing a burden, so that the punishment of the sin of the Caryatids might be handed down to the memory of posterity. No less did the Laconians Spartans, with Pausanias, the son of Cleombrotus, as their leader, after they had overcome the infinite number of the Persian army with a small force in the battle of Plataea, having celebrated a glorious triumph, set up the Persian portico as a trophy for posterity from the spoils and booty, a sign of the praise and virtue of the citizens, and of their victory. There, they placed statues of the captives, wearing barbaric ornament, punished with insults worthy of their pride, supporting the roof, so that the enemies, moved by the fear of their fortitude, might shudder, and the citizens, seeing that example of virtue, uplifted by glory, might be prepared to defend their liberty. Therefore, from this, many have placed statues of Persians supporting epistyles architraves and their ornaments, and from that argument, have increased the excellence of their works. Likewise, there are other histories of the same kind, the knowledge of which architects ought to hold. Philosophy, indeed, perfects the architect with a great spirit, so that he is not arrogant, but rather approachable, fair, and faithful, without greed, which is the greatest thing. For no work can truly be done without faith and purity. Let him not be covetous, nor have his mind occupied with receiving gifts, but let him maintain his own dignity with gravity by holding a good reputation. For this is what Philosophy prescribes. Furthermore, philosophy explains the nature of things, which in Greek is called physiologia natural science, which it is necessary for the student to know because it has many and varied natural questions, as in the conduction of waters. For in the courses, circuits, and the leveled plane, and in the expressions of pressure, natural spirits act in different ways; no one will be able to remedy their obstructions unless he knows the principles of the nature of things from Philosophy. Likewise, whoever reads the books of Ctesibius or Archimedes, and the others who have written precepts of this kind, will not be able to agree with them unless he has been instructed in these things by philosophers. Moreover, he must know Music, so that he may have knowledge of canonical theoretical and mathematical reason; furthermore, of the temperatures of balistae, catapults, and scorpiones...