Axe handle and smart meter: what they have in common

1. Step 1. Axe handle — is part of — Axe. A handle.
2. Step 2. Axe — is made of — Stone. A Neolithic axe is ground stone on a handle.
3. Step 3. Stone — is material for — Balance scale. Weights were hewn from stone.
4. Step 4. Balance scale — evolved into — Electronic scales. Electronic scales.
5. Step 5. Electronic scales — has part — Liquid-crystal display. The reading is on an LCD.
6. Step 6. Liquid-crystal display — is part of — Smart meter. A display.

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