As regards the efficacy of the art and the theories of it, I promise and expect that in these volumes I shall undoubtedly show myself of very conside… - Vitruvius

There are also in some places springs which have the peculiarity of giving fine singing voices to the natives, as at Tarsus in Magnesia and in other countries of that kind.

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.

Music, also, the architect ought to understand so that he may have knowledge of the canonical and mathematical theory, and besides be able to tune ballistae, catapultae, and scorpiones to the proper key. For to the right and left in the beams are the holes in the frames through which the strings of twisted sinew are stretched by means of windlasses and bars, and these strings must not be clamped and made fast until they give the same correct note to the ear of the skilled workman.