Tower crane and joystick: what they have in common

1. Step 1. Tower crane — evolved from — Crane (ancient). The modern crane is a development of the ancient crane with a block and tackle.
2. Step 2. Crane (ancient) — has part — Windlass. The rope was wound on a windlass.
3. Step 3. Windlass — has part — Ratchet. A ratchet holds the load.
4. Step 4. Ratchet — has part — Spring. The pawl spring.
5. Step 5. Spring — is part of — Joystick. They return the stick to the centre.

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