Tunnel lining and mechanical clock: what they have in common

1. Step 1. Tunnel lining — is part of — Tunnel. A lining of concrete or segments.
2. Step 2. Tunnel — has part — Street light. Lighting.
3. Step 3. Street light — is part of — Stadium. Floodlights.
4. Step 4. Stadium — is made of — Stone. Ancient stadiums had stone stands.
5. Step 5. Stone — is material for — Water clock (clepsydra). The clepsydra from Karnak is a stone vessel.
6. Step 6. Water clock (clepsydra) — evolved into — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

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