2.2 Alberti In reference to this antique understanding of harmony as the union of antagonisms Leon Battista Alberti (1404-1472) developed his principles of architecture. “De Re Aedificato-ria” [1] is subdivided into ten books and de-scribes how to achieve harmony in architecture. Beauty was for Alberti "the harmony of all parts in relation to one another," and subse-quently based on the Pythagorean ideas "this concord is realized in a particular number, proportion, and arrangement demanded by harmony". Alberti’s ideas remained the classic treatise on architecture from the sixteenth until the eighteenth century and even longer.