Xu Xiake, a famous traveler, described this spectacle in the third year of Chongzhen in the Ming Dynasty (AD 1630): "Climbing to the top of the mountain goes far through the north of the mountain, and there is no room for shoulders in the middle, but if you cover it, you will go straight through it." I have seen a number of' seeing the sky for the first time', Wuyi and Huangshan, and I have never seen those who are forced and far away. "Whenever at noon, the sky is clear and the sun is shining, I look up and see the skylight, which is magnificent. From the geological point of view, the formation of horizon is due to crustal movement, and rocks gradually rise through extrusion to form gaps. This kind of gap is called geological joint. This kind of joint and fissure on the rock surface is most likely to be eroded by running water, forming a straight and narrow deep ditch completely consistent with the joint trend, that is, forming a strange Danxia landform landscape with "a glimpse of the sky". There are as many as six "first-line sky" scenic spots in Taoyuan Cave, which is one of the few scenic spots with Danxia landform in China and the best landscape in Taoyuan Cave.
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