Sketchpad and rock drill: what they have in common

1. Step 1. Sketchpad — inspired — Graphical user interface. The ideas of direct manipulation of objects.
2. Step 2. Graphical user interface — uses — Computer mouse. The pointer is controlled with a mouse.
3. Step 3. Computer mouse — has part — LED. An optical mouse.
4. Step 4. LED — is part of — Street light. LEDs.
5. Step 5. Street light — is part of — Tunnel. Lighting.
6. Step 6. Tunnel — uses — Rock drill. Driving the Mont Cenis tunnel.

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