定义
建筑物的细部名称，一般位于建筑物台阶侧面内凹处一直角三角形的部位，该词见于宋李诫《营造法式》卷三。
A small part of a building, generally a hollowed right triangle space on the side of a stair. The term Xiangyan, literally the elephant eye, was first recorded in Vol.3 of Modes of Construction by Lijie of the Song Dynasty.