Rear-view mirror and plumbing: what they have in common

1. Step 1. Rear-view mirror — is a kind of — Mirror. A mirror.
2. Step 2. Mirror — is part of — Glass dome. A mirrored cone directs light into the hall.
3. Step 3. Glass dome — is a kind of — Dome. A dome.
4. Step 4. Dome — evolved from — Arch. A dome is an arch rotated around an axis.
5. Step 5. Arch — is part of — Aqueduct. Roman aqueducts rested on arcades.
6. Step 6. Aqueduct — works like — Plumbing. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.

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