In a period of over 1,000 years, every new arrival set to carve out a cave in an open space on the cliff on a sudden impulse. No one has ever made any demonstration and calculation based on structural mechanics.

• 一千多年间，每一位后来者都是根据自已的灵感，在山崖上看中一块空白处随意开凿，没有谁去作过结构力学的论证和计算。