Macadam road and mechanical clock: what they have in common

1. Step 1. Macadam road — is a kind of — Paved road. A road.
2. Step 2. Paved road — is made of — Stone. Paved roads were laid with stone.
3. Step 3. Stone — is material for — Water clock (clepsydra). The clepsydra from Karnak is a stone vessel.
4. Step 4. Water clock (clepsydra) — evolved into — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

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