Wood-fired oven and cannon: what they have in common

1. Step 1. Wood-fired oven — has part — Dome. A vaulted chamber.
2. Step 2. Dome — evolved from — Vault. A vault of revolution.
3. Step 3. Vault — is part of — Gothic cathedral. Rib vaults.
4. Step 4. Gothic cathedral — has part — Window glass. Stained glass.
5. Step 5. Window glass — uses — Casting. The panes were cast in moulds.
6. Step 6. Casting — is used in — Cannon. Barrels were cast.

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