Graphical user interface and piston pump: what they have in common

1. Step 1. Graphical user interface — was inspired by — Sketchpad. The ideas of direct manipulation of objects.
2. Step 2. Sketchpad — uses — Cathode-ray tube. A CRT screen.
3. Step 3. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
4. Step 4. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.
5. Step 5. Newcomen engine — has part — Piston pump. The beam drove a mine pump.

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