Smoke detector and gutenberg printing press: what they have in common

1. Step 1. Smoke detector — has part — Photodiode. An optical scattering sensor.
2. Step 2. Photodiode — is part of — Lidar. A receiver of reflected light.
3. Step 3. Lidar — has part — Laser diode. Laser pulses.
4. Step 4. Laser diode — is part of — Laser printer. A laser draws the image on the drum.
5. Step 5. Laser printer — is a kind of — Printer. A printer.
6. Step 6. Printer — works like — Gutenberg printing press. A printer is a personal printing press: it transfers an image onto paper.

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