Library catalogue and sewage treatment plant: what they have in common

1. Step 1. Library catalogue — evolved into — Database. Systematizing records.
2. Step 2. Database — is used in — Chess computer. An opening book and endgame databases.
3. Step 3. Chess computer — has part — Server. IBM RS/6000 SP nodes.
4. Step 4. Server — is part of — Data centre. Thousands of servers.
5. Step 5. Data centre — is made of — Concrete. The building is concrete.
6. Step 6. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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