Gamepad and oil well: what they have in common

1. Step 1. Gamepad — evolved from — Joystick. A game controller.
2. Step 2. Joystick — has part — Spring. They return the stick to the centre.
3. Step 3. Spring — is part of — Elevator safety brake. Springs throw out the catches when the rope goes slack.
4. Step 4. Elevator safety brake — is made of — Wrought iron. The safety catches are wrought iron.
5. Step 5. Wrought iron — is material for — Oil well. The casing pipes are iron.

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