Horn and joystick: what they have in common

1. Step 1. Horn — is part of — Phonograph. A horn.
2. Step 2. Phonograph — was inspired by — Electrical telegraph. Edison came to the phonograph while working on recording telegraph and telephone signals.
3. Step 3. Electrical telegraph — uses — Electromagnetism. A telegraph receiver is an electromagnet that attracts an armature.
4. Step 4. Electromagnetism — is used in — Vibration motor. Like any electric motor, it turns thanks to electromagnetism.
5. Step 5. Vibration motor — is part of — Gamepad. Vibration.
6. Step 6. Gamepad — evolved from — Joystick. A game controller.

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