Li Chien-lang commented the reason the chihchaichuang is divided is that it is convenient to push open the top while if the entire window were removed it would not only be difficult but unsightly as well.
李乾朗指出，支摘窗之所以分上下兩部分，是因「支」的部份以輕巧為要，若整片支出，不僅不便，也不美觀。