Method & privacy
How casting works
Each line is cast with three coins. By convention Heads = 3 and Tails = 2, so three coins total 6, 7, 8 or 9. Six throws build the hexagram from the bottom up. Online casting uses your browser's cryptographically secure randomness; you can also toss real coins and enter each result.
| Total | Name | Original | Transformed | Probability |
|---|---|---|---|---|
| 6 | Old yin 老阴 | Yin (broken) | Yang (solid) | 1/8 |
| 7 | Young yang 少阳 | Yang (solid) | Yang (solid) | 3/8 |
| 8 | Young yin 少阴 | Yin (broken) | Yin (broken) | 3/8 |
| 9 | Old yang 老阳 | Yang (solid) | Yin (broken) | 1/8 |
6 and 9 are changing lines. In the original hexagram 7 and 9 are yang; in the transformed hexagram 6 and 7 are yang. Hexagrams are calculated deterministically in code against the King Wen sequence. The AI never casts or alters a result. With no changing lines, the original hexagram stands alone.
Rule version: three-coin/h3t2/v1
Interpretation convention
The original hexagram is the primary context, changing lines mark transitions, and the transformed hexagram is secondary context. Traditional schools weigh multiple changing lines differently; oogee uses this one convention and labels it clearly.
About AI guidance
AI guidance is generated only when you ask for it, and only from the classical passages oogee supplies. It is instructed to keep original text, translation and its own synthesis separate and never to invent quotations; quotations that can't be verified against the sources are removed automatically. It supports reflection only and is not a prediction or medical, legal or financial advice.
Privacy
- ·No account needed. Your device receives a random private cookie and your readings are linked only to it. A reading link alone never reveals anyone's question.
- ·When you request AI guidance or ask a follow-up, your question and reading are sent to our AI provider (OpenAI) for processing and are not used for training.
- ·You can permanently delete a reading, with its guidance, conversation and reflections, at any time.
- ·Signing in is optional. With Google sign-in we store only your Google account identifier, email and name, to sync readings across devices. You can delete your account and all its readings at any time from the Account page.
- ·Readings made without signing in are deleted automatically after one year.
- ·We count only anonymous daily totals (such as completed castings), never identities, IP addresses or question text.
- ·Please don't include other people's private or sensitive details in your questions.
Sources
周易（經、彖傳、象傳）
Wikisource 維基文庫 transcription
Public domain (original text); transcription CC BY-SA 4.0
https://zh.wikisource.org/wiki/周易The Yî King, translated by James Legge
Sacred Books of the East, vol. XVI (Oxford, 1882)
Public domain
https://en.wikisource.org/wiki/Sacred_Books_of_the_East/Volume_16
Corpus version: 2026-10-22