Hexagram 18 · Work on the Decayed (蠱 Gǔ)
Mountain ☶ over Wind ☴
Wind stilled at the mountain's foot · what was let go has spoiled
Work on the Decayed is the hexagram of repair, of facing a mess that neglect has allowed to grow and setting it right. The Chinese name pictures a bowl of food left so long that worms breed in it, which sounds grim until you read the rest of the figure, because the whole point is that decay is a call to renewal, not a verdict of doom. Something has been let slide. The task in front of you is to fix it.
Mountain sits above, still and obstructing; Wind sits below, stopped at the mountain's base where its movement stagnates. The combination is stagnation, the conditions under which things spoil. But the commentary frames the work optimistically: putting right what was let go brings real advance, and the old text gives a striking structure of reflecting for three days before you begin and three days after, so that the repair is thorough and the cause understood. This is renewal through honest, deliberate effort.
What this hexagram counsels in a reading
When Gu answers your question, it is pointing at something that has been allowed to deteriorate, perhaps for a while, and asking you to face it honestly and do the repair work fully. The counsel is not to paper over the problem or to act in haste, but to understand how it got this way and to mend it properly. The hexagram treats trouble as an opportunity: the very fact that something has decayed is your chance to restore it, and the restoration can be a genuine step forward.
In love and relationships
For relationships, Work on the Decayed often points to something that has been neglected, an unspoken resentment, a problem long avoided, a pattern allowed to rot. The counsel is to address it honestly rather than letting it fester further. This is repair work, and repair work in a relationship can be deeply renewing when it is done with care and a real understanding of how things got here. The danger is only in continuing to look away.
In work and money
In work, Gu describes a situation that has been mismanaged or left to slide and now needs serious cleaning up. Take it on fully; understand the root cause; do the repair thoroughly rather than patching it. With money, it points to neglected affairs that need attention, debts, accounts, or arrangements that have decayed through avoidance, and it rewards the disciplined effort to set them in order properly.
Moving lines and the changing hexagram
The moving lines of Work on the Decayed describe repairing what different people, often parents in the old text, have spoiled, with care taken not to be too harsh or too lax. A changing line here usually comments on how you are handling the repair and whose neglect you are correcting. Read it as guidance on doing the mending thoroughly and fairly. The hexagram it becomes shows what the restored situation turns into once the work is done.
Its Tarot kin
On the deck side of this site, Work on the Decayed rhymes with Death. Both are about endings that clear the way for renewal, the necessary breakdown of what has run its course. Death is transformation, the old form released so the new can come; Gu is that same cycle, the decay that, faced honestly, becomes the ground for something restored.
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