Stilt footrests and incandescent light bulb: what they have in common

1. Step 1. Stilt footrests — is part of — Stilts. Platforms at height.
2. Step 2. Stilts — uses — Lever. An extended support.
3. Step 3. Lever — uses — Torque. A lever is a moment of force around a fulcrum.
4. Step 4. Torque — is used in — Geneva drive. It turns continuous rotation into intermittent motion.
5. Step 5. Geneva drive — is part of — Film projector. Intermittent advance of the film.
6. Step 6. Film projector — has part — Incandescent light bulb. The light source (formerly an arc).

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