Pipe organ and LIGO: what they have in common

1. Step 1. Pipe organ — has part — Keyboard. Manuals were the first keyboards.
2. Step 2. Keyboard — is part of — Piano. A keyboard.
3. Step 3. Piano — uses — Tuning fork. Tuning.
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 — is made of — Silica (sand). The resonator is a quartz crystal.
6. Step 6. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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