Carriage and headphones: what they have in common

1. Step 1. Carriage — has part — Spoked wheel. Wheels.
2. Step 2. Spoked wheel — is part of — Chariot. The chariot was the first machine with spoked wheels.
3. Step 3. Chariot — uses — Bit and bridle. Controlling the horses.
4. Step 4. Bit and bridle — has part — Headband. Straps on the head.
5. Step 5. Headband — is part of — Headphones. A band that presses the cups.

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