Digital projector and electric motor: what they have in common

1. Step 1. Digital projector — evolved from — Film projector. Digital projection.
2. Step 2. Film projector — has part — Incandescent light bulb. The light source (formerly an arc).
3. Step 3. Incandescent light bulb — evolved into — LED lamp. It replaced incandescent bulbs.
4. Step 4. LED lamp — has part — Heat sink. LEDs get warm, so the lamp has an aluminium heat sink.
5. Step 5. Heat sink — is part of — CPU cooler. A heat sink.
6. Step 6. CPU cooler — has part — Electric motor. A motor.

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