Hammer head and headphones: what they have in common

1. Step 1. Hammer head — is part of — Hammer. The striking part.
2. Step 2. Hammer — is made of — Stone. The first hammer was a hammerstone, later mounted on a handle.
3. Step 3. Stone — is material for — Stadium. Ancient stadiums had stone stands.
4. Step 4. Stadium — has part — Public address system. Sound.
5. Step 5. Public address system — has part — Loudspeaker. Loudspeakers.
6. Step 6. Loudspeaker — is part of — Headphones. Miniature drivers.

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