Violin and laser: what they have in common

1. Step 1. Violin — uses — Resonance. Resonance of the body.
2. Step 2. Resonance — is used in — Quartz clock. Resonance of the crystal.
3. Step 3. Quartz clock — is made of — Silica (sand). The resonator is a quartz crystal.
4. Step 4. Silica (sand) — is material for — LIGO. The mirrors are fused silica.
5. Step 5. LIGO — uses — Laser. A laser.

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