Software and oil lamp: what they have in common

1. Step 1. Software — includes — Video game. Software.
2. Step 2. Video game — is used in — Arcade machine. Games.
3. Step 3. Arcade machine — has part — Cathode-ray tube. A CRT monitor.
4. Step 4. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
5. Step 5. Vacuum — is used in — Incandescent light bulb. The bulb was evacuated so the filament would not burn out.
6. Step 6. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.

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