Barrel and kiln: what they have in common

1. Step 1. Barrel — works like — Arch. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.
2. Step 2. Arch — is made of — Brick. Arches were built of brick or stone.
3. Step 3. Brick — uses — Kiln. Fired brick is stronger than mud brick.

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