Dam and chisel: what they have in common

1. Step 1. Dam — is made of — Roman concrete. Ancient dams; modern ones are made of concrete.
2. Step 2. Roman concrete — is material for — Amphitheatre. The Colosseum.
3. Step 3. Amphitheatre — works like — Stadium. The Greek stadium is older than the Roman amphitheatre; modern stadiums combine both layouts.
4. Step 4. Stadium — has part — Street light. Floodlights.
5. Step 5. Street light — is part of — Tunnel. Lighting.
6. Step 6. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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