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Built at Meta Global AI Developer Hackathon · Oct 26, 2026 · Remote

Mneme turns a future letter — to yourself, or to someone you love — into something living. You write it, pick a reveal date, and a unique tree starts growing from its seed on a shared floating island. Day by day (on Mneme's demo clock) it sprouts, branches, and leafs out. When the reveal date arrives, the tree is mature and the letter finally opens.