Scaffolding and laser: what they have in common

1. Step 1. Scaffolding — has part — Ladder. Ladders between the levels.
2. Step 2. Ladder — uses — Friction. The feet hold on the floor by friction.
3. Step 3. Friction — is used in — Ball bearing. A bearing replaces sliding friction with far lower rolling friction.
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.
6. Step 6. LIGO — uses — Laser. A laser.

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