The question comes before the ritual
The most important part of an I Ching reading happens before any coins are tossed. You need to name the situation, the decision window, what you can act on, and what remains outside your control.
If the question changes after the hexagram appears, the reading loses its boundary. Oracle asks for a concrete question because the hexagram needs something real to speak to, not a vague mood that can be reinterpreted after the fact.
How three coins build six lines
The common method is to toss three coins six times, recording the lines from bottom to top. Each throw produces young yin, young yang, old yin, or old yang. Young lines are stable; old lines are changing lines.
The yarrow-stalk method is slower and more traditional, but the logic is the same: the result is generated by a repeatable process outside your preference. That is why Oracle avoids re-roll mechanics. If users can keep casting until the answer feels better, the reading has already been compromised.
No re-rolls protects the reading
Wanting another cast usually means the first result did not soothe the anxiety. That discomfort is part of the information: it shows what you hoped for, what you feared, and which outcome you were already trying to avoid.
If the question was genuinely wrong, the answer is not to immediately cast again. Write the question more honestly, wait, and return later. One question, one cast: that boundary keeps the I Ching reflective instead of decorative.