The magnet became a user interface.

Apple’s MagSafe ring — adopted into the Wireless Power Consortium’s Qi2 standard — uses a ring of magnets to self-align charging coils to within about 1.55 mm. Alignment is the difference between efficient wireless charging and a warm, slow one; the magnet does silently what a human fumbling in the dark cannot.

Why coded · This is the mass-market proof of the align behavior: force that peaks at registration and steers toward it. Apple also holds its own coded-connector patents (US 2012/0021619) — the idea has been circling Cupertino for over a decade.

The original 2006 MagSafe laptop connector and successors like Griffin’s BreakSafe established the safety case: a connector that holds firmly in normal use and releases cleanly when a cable is snagged, saving the device instead of the connection.

Why coded · A coded pair adds a designed force profile: strong in tension, weak in the peel or slide direction you want it to fail in — failure direction becomes a printed property.

The Pencil lands on the iPad edge, centers itself, and begins charging — attach + align + electrical mating in one gesture with no moving parts. Lid and case closures with Hall-sensor sleep/wake are the same family: the magnet is both fastener and signal.

Polymagnet’s catalog sells twist-release and attenuated-field mounting pairs aimed squarely at device mounting — grip like a clamp, twist to eject, field near zero a quarter-inch away [vendor figure]. The products exist and are purchasable; adoption by a named phone-accessory brand is not confirmed, so this stays illustrative.

Why coded · Contained field matters most here: phones are dense with Hall sensors, compasses and cards that ordinary magnets upset.

A coded closure’s snap profile — how it accelerates into its seat, how it detents, how it lets go — is a printable curve. Tuning that feel the way audio teams tune a click is an obvious frontier; no shipping example is confirmed.