Windlass and headphones: what they have in common

1. Step 1. Windlass — includes — Anchor windlass. A ship’s windlass.
2. Step 2. Anchor windlass — uses — Anchor. It raises the anchor.
3. Step 3. Anchor — is part of — Sailing ship. An anchor.
4. Step 4. Sailing ship — has part — Compass. A magnetic compass.
5. Step 5. Compass — has part — Permanent magnet. The needle is a magnet.
6. Step 6. Permanent magnet — is part of — Headphones. A magnet moves the diaphragm.

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