BookCrossing is a tracking platform – books are registered in a global database and finders are directed to log their discovery through the system. Little Free Library is an infrastructure network – fixed physical locations where books are exchanged. OSP is a literary movement – books are released with intention, carry a reflection from the person who set them free, and invite the finder to add their own. The archive is built from human moments, not system logins. Participation is an act, not a transaction.