Saddle girth and LIGO: what they have in common

1. Step 1. Saddle girth — is part of — Saddle. A girth under the horse’s belly.
2. Step 2. Saddle — is part of — Bicycle. The bicycle saddle took its name from the horse saddle.
3. Step 3. Bicycle — has part — Ball bearing. Ball bearings in the hubs and bottom bracket let the wheels and pedals spin easily.
4. Step 4. Ball bearing — is part of — Base isolation. Friction pendulum bearings.
5. Step 5. Base isolation — is part of — LIGO. The suspension damps ground vibrations.

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