Lighthouse tower and electrical grid: what they have in common

1. Step 1. Lighthouse tower — is part of — Lighthouse. A tall base for the light source.
2. Step 2. Lighthouse — is part of — Seaport. A lighthouse.
3. Step 3. Seaport — has part — Breakwater. A breakwater.
4. Step 4. Breakwater — is made of — Concrete. Concrete blocks.
5. Step 5. Concrete — is material for — Data centre. The building is concrete.
6. Step 6. Data centre — uses — Electrical grid. Power.

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