A quiet, aimed signal between vessels in fog.

Aldis is a presence layer organized around how human attention actually works. Your contacts are sorted into Dunbar layers — the two-or-so people who hold your weight, the five-ish who would drop everything, the fifteen, the fifty, the hundred and fifty, and the long tail beyond.

One status, six fidelities. Your closest layer sees the room you're in. The next sees the neighborhood. The next, the city. By the time you reach the long tail, all that remains is a Mark — a quiet sign that you're alive.

Presence is a routing problem, not a publishing problem. Aldis routes.