You arrive to a single sentence someone wrote days, months, or years ago. You can hold it — a quiet favorite — or ask for another. When you leave, you add one sentence for whoever comes after you.
Age labels matter here: "left 400 days ago" is part of the emotion. The experiment is minimal on purpose — no threads, no replies, just presence across time.
Favorites surface sentences strangers refused to let go of. Sharing sends someone a specific line, not your own identity.
This is not a guestbook with names. It is a capsule you pass forward without knowing who opens it.