Mailbox body and oil lamp: what they have in common

1. Step 1. Mailbox body — is part of — Letter box. A steel box.
2. Step 2. Letter box — uses — Postal service. The post.
3. Step 3. Postal service — uses — Steam locomotive. Mail trains.
4. Step 4. Steam locomotive — has part — Chimney. Smoke from the firebox leaves through the locomotive's chimney.
5. Step 5. Chimney — is made of — Stone. And stone.
6. Step 6. Stone — is material for — Oil lamp. The first lamps were stone bowls (Lascaux).

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