Snap fastener and smartphone: what they have in common

1. Step 1. Snap fastener — has part — Spring. A spring ring.
2. Step 2. Spring — is part of — Joystick. They return the stick to the centre.
3. Step 3. Joystick — evolved into — Gamepad. A game controller.
4. Step 4. Gamepad — has part — Vibration motor. Vibration.
5. Step 5. Vibration motor — is part of — Smartphone. A tiny motor produces the vibration alert.

Open Evothings