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Vitruvius, thus, deals with many theoretical issues concerning architecture.
Vitruvius advised that lead should not be used to conduct drinking water, clay pipes being preferred.
Vitruvius was very much of this type, a fact reflected in De architectura.
He covered a wide variety of subjects he saw as touching on architecture.
Perhaps the most famous declaration from De architectura is one still quoted by architects: "Well building hath three conditions: firmness, commodity, and delight." This quote is taken from Sir Henry Wotton's version of 1624, and is a plain and accurate translation of the passage in Vitruvius (2): but English has changed since then, especially in regard to the word "commodity", and the tag is usually misunderstood.
A modern interpretation of Wotton's English might render it thus: "The ideal building has three elements; it is sturdy, useful, and beautiful." Vitruvius also studied human proportions (Book III) and his canones were later encoded in a very famous drawing by Leonardo da Vinci (Homo Vitruvianus, "Vitruvian Man").