Skateboard and bell: what they have in common

1. Step 1. Skateboard — has part — Ball bearing. Wheels on bearings.
2. Step 2. Ball bearing — is part of — Hard disk drive. Bearings (later fluid-dynamic ones).
3. Step 3. Hard disk drive — is part of — Personal computer. A hard disk.
4. Step 4. Personal computer — has part — Keyboard. A keyboard.
5. Step 5. Keyboard — is part of — Carillon. A keyboard.
6. Step 6. Carillon — has part — Bell. Bells.

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