Penny-farthing and joystick: what they have in common

1. Step 1. Penny-farthing — has part — Ball bearing. Bearings.
2. Step 2. Ball bearing — is part of — Hard disk drive. Bearings (later fluid-dynamic ones).
3. Step 3. Hard disk drive — evolved into — Solid-state drive. A replacement for the hard disk.
4. Step 4. Solid-state drive — has part — Microcontroller. A controller manages the memory.
5. Step 5. Microcontroller — is part of — Gamepad. A microcontroller polls the buttons.
6. Step 6. Gamepad — evolved from — Joystick. A game controller.

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