In meditation, the sitting posture is like a mountain, with the pointed head at the top and our knees folded like the bottom of the mountain. The purpose is to merge the spirit, body and mind in one or in our innate nature. In Chuang Tzu’s terms it’s letting the energy flow in Nature’s cycle of polarities or merging heaven, man and earth as “all things and I are one” depicted by the vertical and horizontal strokes of “One”.
Drawing of three mountains became the pictogram of “Mountain” with the mountains on left and right reduced to vertical strokes. When the strokes shorten, we have the Chinese character of “Mountain’.
The drawing of mountains can be simplified into a triangle depicting heaven,earth and man in ONE or body, mind and spirit in modern terms. This is the triangle in Sengai’s Universe, the well known Zen painting.