Bike light with dynamo and typewriter: what they have in common

1. Step 1. Bike light with dynamo — has part — LED. An LED.
2. Step 2. LED — is part of — Computer mouse. An optical mouse.
3. Step 3. Computer mouse — is used in — Graphical user interface. The pointer is controlled with a mouse.
4. Step 4. Graphical user interface — evolved from — Command line. The graphical interface replaced the text one.
5. Step 5. Command line — evolved from — Typewriter. The teletype was a printing terminal.

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