Armillary sphere and electrical grid: what they have in common

1. Step 1. Armillary sphere — works like — Orrery. Both are mechanical models of the sky: the armillary sphere shows celestial circles, the orrery the planets' motion.
2. Step 2. Orrery — evolved into — Planetarium. Models of the sky.
3. Step 3. Planetarium — is made of — Concrete. Zeiss’s first dome was thin concrete.
4. Step 4. Concrete — is material for — Data centre. The building is concrete.
5. Step 5. Data centre — uses — Electrical grid. Power.

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