What does it mean to not know the true face of Mount Lu just because you are in this mountain?

The reason why I cannot recognize the true face of Lushan Mountain is because I am in Lushan Mountain. It is a metaphor for the answers that can be obtained by looking at things from different angles. It also contains the profound philosophy: "Those in authority are confused, but those who watch are clear".

[From] "Inscription on the Western Forest Wall" by Su Shi of the Northern Song Dynasty

Viewed horizontally, it looks like a ridge and a peak on the side, with different heights near and far. I don’t know the true face of Mount Lu, just because I am in this mountain.

"Ti Xi Lin Bi" is Su Shi's reflections after visiting Mount Lu. It describes the changing appearance of Mount Lu, and uses the scenery to reason, using the life philosophy of "Those who are in authority are confused, those who are onlookers are clear" to tell readers what to think about. To have a comprehensive understanding of things, you must stand on an objective standpoint. The strength of this quatrain lies not in its image or emotion, but in its sense and interest.

Looking at Lushan Mountain from the front, it is a long horizontal ridge; looking at Lushan Mountain from the side, it is a towering peak. If you look at it from different distances and angles, the Lushan Mountain that appears in front of you will have different images. Why can't we grasp the true appearance of Mount Lu accurately and completely? Just because people are in the mountains and their vision is limited.