藝術與建築詞典根目錄
....物件層面
........組件 (層級名)
............成分
................<依特定背景區分之組件>
....................建築元素
........................<流通元素>
............................<階梯與階梯結構>
................................<階梯結構>
....................................<台階與台階結構>
........................................台階
............................................楔型台階
|||................................................平衡階梯
|||................................................螺旋梯 (楔型台階)
............................................凸面台階 (台階)
|||................................................圓角台階 (凸面台階)