Folding frame hinge and personal computer: what they have in common

1. Step 1. Folding frame hinge — is part of — Folding bicycle. It folds the frame in half.
2. Step 2. Folding bicycle — has part — Bicycle wheel. Small-diameter wheels.
3. Step 3. Bicycle wheel — has part — Ball bearing. The wheel hub turns on ball bearings.
4. Step 4. Ball bearing — is part of — Hard disk drive. Bearings (later fluid-dynamic ones).
5. Step 5. Hard disk drive — is part of — Personal computer. A hard disk.

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