Computer graphics and boiler: what they have in common

1. Step 1. Computer graphics — includes — Sketchpad. One of the first interactive graphics programs.
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 — Boiler. Steam from the boiler.

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