Barrel staves and atomic clock: what they have in common

1. Step 1. Barrel staves — is part of — Barrel. Curved oak planks.
2. Step 2. Barrel — is made of — Iron. The staves are bound with iron hoops.
3. Step 3. Iron — is material for — Tuning fork. A tuning fork is a steel or iron fork.
4. Step 4. Tuning fork — is part of — Quartz clock. Quartz shaped like a tuning fork at 32,768 Hz.
5. Step 5. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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