Graphical user interface and rope: what they have in common

1. Step 1. Graphical user interface — evolved from — Command line. The graphical interface replaced the text one.
2. Step 2. Command line — evolved from — Typewriter. The teletype was a printing terminal.
3. Step 3. Typewriter — works like — Movable type. Each typebar carries a piece of movable type pressed against the paper.
4. Step 4. Movable type — is made of — Clay. Bi Sheng’s type was made of fired clay.
5. Step 5. Clay — is material for — Yo-yo. Greek yo-yos were terracotta.
6. Step 6. Yo-yo — has part — Rope. A thread.

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