Wallet and joystick: what they have in common

1. Step 1. Wallet — uses — Paper money. It holds money.
2. Step 2. Paper money — evolved into — Payment card. The next form of money.
3. Step 3. Payment card — has part — Integrated circuit. An EMV chip.
4. Step 4. Integrated circuit — includes — Microcontroller. A chip.
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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