The influential ancient Roman architect Vitruvius argued that the design of a building such as a temple depends on two qualities, proportion and "symmetria". Proportion ensures that each part of a building relates harmoniously to every other part. "Symmetria" in Vitruvius's usage means something closer to the English term modularity than mirror symmetry, as again it relates to the assembling of (modular) parts into the whole building. In his Basilica at Fano, he uses ratios of small integers, especially the triangular numbers (1, 3, 6, 10, ...) to proportion the structure into (Vitruvian) modules. Thus the Basilica's width to length is 1:2; the aisle around it is as high as it is wide, 1:1; the columns are five feet thick and fifty feet high, 1:10.