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Vitruvius - ten books about architecture/ the only preserved ancient work about architecture, the architecture is composed of the idea (ordinatio), the layout of the image (dispositio), the symmetrie (dekor) and the economic balance (distributio). The greeks and also the philosopher Platon called the number ten „the perfect number“ because a human being has ten fingers. The mathematics say:“ The perfect number is the one that belongs to Euklides equation n = 2^k-1 (2^k - 1).“