Lighthouse and glasses: what they have in common

1. Step 1. Lighthouse — is part of — Seaport. A lighthouse.
2. Step 2. Seaport — uses — Sailing ship. A port receives ships.
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 — Glasses. Lenses.

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