Column and oil well: what they have in common

1. Step 1. Column — is made of — Brick. Stone columns.
2. Step 2. Brick — is material for — Chimney. Chimneys are brick.
3. Step 3. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.
4. Step 4. Steam locomotive — is made of — Wrought iron. The boiler is wrought iron.
5. Step 5. Wrought iron — is material for — Oil well. The casing pipes are iron.

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