Mirror and smart meter: what they have in common

1. Step 1. Mirror — is part of — Sextant. Mirrors — the principle of double reflection.
2. Step 2. Sextant — is part of — Sailing ship. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
3. Step 3. Sailing ship — has part — Compass. A magnetic compass.
4. Step 4. Compass — has part — Permanent magnet. The needle is a magnet.
5. Step 5. Permanent magnet — is part of — Electricity meter. A braking magnet.
6. Step 6. Electricity meter — evolved into — Smart meter. A digital meter.

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