Protective roof and oil lamp: what they have in common

1. Step 1. Protective roof — is part of — Battering ram. A roof that protects the crew.
2. Step 2. Battering ram — works like — Pile driver. A battering ram and a pile driver both strike with a heavy weight: one breaks gates, the other drives piles.
3. Step 3. Pile driver — uses — Pile. It drives piles.
4. Step 4. Pile — is part of — Foundation. A pile foundation.
5. Step 5. Foundation — is made of — Stone. Ancient foundations were laid of stone.
6. Step 6. Stone — is material for — Oil lamp. The first lamps were stone bowls (Lascaux).

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