Oar blade and glasses: what they have in common

1. Step 1. Oar blade — is part of — Oar. The flat part in the water.
2. Step 2. Oar — is part of — Boat. A boat was moved by oars.
3. Step 3. Boat — evolved into — Sailing ship. Sailing ships grew out of rowing boats.
4. Step 4. Sailing ship — has part — Sextant. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
5. Step 5. Sextant — has part — Lens. The sextant’s telescope.
6. Step 6. Lens — is part of — Glasses. Lenses.

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