Aramid ballistic panels and mechanical clock: what they have in common

1. Step 1. Aramid ballistic panels — is part of — Body armour. Layers of aramid fabric.
2. Step 2. Body armour — works like — Tank. One idea of protection — armour — at different scales.
3. Step 3. Tank — has part — Transmission (gearbox). The transmission carries torque to the drive sprockets and lets the tank turn.
4. Step 4. Transmission (gearbox) — has part — Gear. A gearbox is a set of gears.
5. Step 5. Gear — is part of — Mechanical clock. A gear train counts seconds, minutes and hours.

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