Semaphore signal arms and air conditioner: what they have in common

1. Step 1. Semaphore signal arms — is part of — Optical telegraph. The positions of the arms encode characters.
2. Step 2. Optical telegraph — uses — Lens. Signals were read through telescopes.
3. Step 3. Lens — is part of — Planetarium. Projectors.
4. Step 4. Planetarium — is made of — Concrete. Zeiss’s first dome was thin concrete.
5. Step 5. Concrete — is material for — Data centre. The building is concrete.
6. Step 6. Data centre — has part — Air conditioner. Cooling.

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