Sword pommel and shipping container: what they have in common

1. Step 1. Sword pommel — is part of — Sword. A counterweight at the end of the handle.
2. Step 2. Sword — has part — Handle. A handle.
3. Step 3. Handle — is part of — File. A handle.
4. Step 4. File — uses — Friction. Material is removed by the friction of the teeth.
5. Step 5. Friction — is used in — Pallet. The load is held on the deck by friction.
6. Step 6. Pallet — works like — Shipping container. Standardizing units of cargo.

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