The eight trigrams
Mountain Trigram: 艮 ☶
Study gen when you want to understand endings, containment, restraint, and the structural role of stopping in the I Ching.
In short
Gen is open below and solid at the top. It often signals stillness, stopping, delimitation, and the moment when movement reaches a boundary.
Three-line structure
艮 is written as ☶ and encoded as 001. Read from bottom to top, its lines are bottom yin, middle yin, top yang.
This matters because the I Ching is structural first. The character of 艮 begins with its exact line order, not just its later symbolic associations.
What 艮 contributes to a hexagram
Gen is open below and solid at the top. It often signals stillness, stopping, delimitation, and the moment when movement reaches a boundary.
When 艮 appears as a lower or upper trigram, it changes how the full hexagram is read by contributing its own pressure, orientation, and rhythm.
How to study it well
A strong way to study 艮 is to learn its line pattern, its natural image (山), and then notice where it appears inside hexagrams.
That approach keeps the trigram readable as structure, symbol, and part of a larger figure all at once.