macOS and plough: what they have in common

1. Step 1. macOS — was inspired by — Graphical user interface. The Macintosh interface was inspired by the Xerox Alto.
2. Step 2. Graphical user interface — evolved from — Command line. The graphical interface replaced the text one.
3. Step 3. Command line — evolved from — Typewriter. The teletype was a printing terminal.
4. Step 4. Typewriter — has part — Lever. Each key is a system of levers.
5. Step 5. Lever — is used in — Hoe. The handle works as a lever when loosening soil.
6. Step 6. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

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