" A journey or pilgrimage also follows the parabolic curve of an arch: it swings out from a known point and returns symmetrically to a point on the same line or plane, but farther along. For this reason, ancient philosophers chose the arch as a symbol for the process of interpretation. That is why teaching stories, such as those of Jesus or Buddha, are known as parables. "

― , The Cincinnati Arch: Learning from Nature in the City