Wooden stilts and atomic clock: what they have in common

1. Step 1. Wooden stilts — is part of — Stilts. Two long supports.
2. Step 2. Stilts — uses — Lever. An extended support.
3. Step 3. Lever — is part of — Piano. The hammer action is a system of levers.
4. Step 4. Piano — uses — Tuning fork. Tuning.
5. Step 5. Tuning fork — is part of — Quartz clock. Quartz shaped like a tuning fork at 32,768 Hz.
6. Step 6. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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