Pantoum Pattern Builder

Help me construct a pantoum with its interlocking repetition.

Central experience: {{experience}}
Mood: {{mood}}
Opening line to seed the form: {{opening_line}}

The pantoum structure:
- Quatrains where lines 2 and 4 become lines 1 and 3 of the next stanza
- Final stanza uses lines 1 and 3 from stanza 1
- Creates a circular, obsessive, dreamlike quality

Build stanza by stanza:
1. Draft opening quatrain
2. Show how lines migrate
3. Navigate the constraint toward closure
4. Make repetitions feel inevitable, not mechanical

Annotate the pattern as we construct.