Threshold
A group finds out where its dividing line falls. Everyone tells a short story about a polarity, then the group sorts every story onto one side or the other. The stories you all read the same way sit at the ends; the ones you split on sit in the middle, and that middle is the line.
Not designed yet
The front door
Decided by PLAN.md §9.1, §9.2, and by the questions in apps/threshold/DESIGN-QUESTIONS.md.
Create a circle, or join one from a link. Its shape follows the visual thesis (Q10).