Barrel organ and smart meter: what they have in common

1. Step 1. Barrel organ — has part — Pinned cylinder. A pinned cylinder sets the tune.
2. Step 2. Pinned cylinder — is part of — Carillon. Automatic carillons have a pinned drum.
3. Step 3. Carillon — has part — Keyboard. A keyboard.
4. Step 4. Keyboard — is part of — Laptop. The keyboard is built into the laptop's case.
5. Step 5. Laptop — has part — Liquid-crystal display. An LCD screen.
6. Step 6. Liquid-crystal display — is part of — Smart meter. A display.

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