Chimney and barrel: what they have in common

1. Step 1. Chimney — is made of — Brick. Chimneys are brick.
2. Step 2. Brick — is material for — Arch. Arches were built of brick or stone.
3. Step 3. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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