Reactive armour and shaduf: what they have in common

1. Step 1. Reactive armour — is part of — Tank. Modern tanks.
2. Step 2. Tank — works like — Siege tower. An armoured mobile shelter and platform for attacking fortifications.
3. Step 3. Siege tower — has part — Wheel. On wheels.
4. Step 4. Wheel — is used in — Windlass. A windlass is a wheel and axle used as a simple machine.
5. Step 5. Windlass — is used in — Well. The bucket was raised with a windlass.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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