Kevlar and mechanical clock: what they have in common

1. Step 1. Kevlar — is material for — Helmet. Modern ones are aramid.
2. Step 2. Helmet — has part — Dome. A protective shell.
3. Step 3. Dome — evolved from — Vault. A vault of revolution.
4. Step 4. Vault — is part of — Gothic cathedral. Rib vaults.
5. Step 5. Gothic cathedral — has part — Tower clock. A tower clock.
6. Step 6. Tower clock — is a kind of — Mechanical clock. A clock.

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