Folding legs and atomic clock: what they have in common

1. Step 1. Folding legs — is part of — Ironing board. Scissor supports.
2. Step 2. Ironing board — uses — Lever. A folding mechanism.
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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