Carrier, a real-world letter network

Why it surfaced

This is messaging redesigned as a small piece of geography: your first roost is pinned to the earth, letters travel between locations, and deliveries can be encoded with ROT13, Morse, Vigenère, and other ciphers. The pigeons, aliases, intercepts, and emoji reactions give the product a playful social ritual rather than another ordinary inbox.

Carrier lets people send letters between map-pinned “roosts,” using aliases, post offices, delivery notifications, and optional ciphers.