Vibration motor and elevator: what they have in common

1. Step 1. Vibration motor — is part of — Gamepad. Vibration.
2. Step 2. Gamepad — evolved from — Joystick. A game controller.
3. Step 3. Joystick — has part — Spring. They return the stick to the centre.
4. Step 4. Spring — is part of — Elevator safety brake. Springs throw out the catches when the rope goes slack.
5. Step 5. Elevator safety brake — is part of — Elevator. Otis’s safety brakes.

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