 In his original 1436 "tondo e quadro", Bianco has sixteen emanating rays – that is, Bianco includes half-quarter winds, or eighth-winds ("otava"), so that the emanating rays are at intervals of 5.625 degrees.Other constructions of the circle-and-square, e.g.the Cornaro Atlas, use only eight rays emanating at quarter-wind distances (11.25 degrees).