Kayak and incandescent light bulb: what they have in common

1. Step 1. Kayak — is a kind of — Boat. A boat.
2. Step 2. Boat — evolved into — Sailing ship. Sailing ships grew out of rowing boats.
3. Step 3. Sailing ship — has part — Sextant. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
4. Step 4. Sextant — has part — Lens. The sextant’s telescope.
5. Step 5. Lens — is part of — Film projector. A projection lens.
6. Step 6. Film projector — has part — Incandescent light bulb. The light source (formerly an arc).

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