Cart and router: what they have in common

1. Step 1. Cart — has part — Axle. The wheels turn on an axle.
2. Step 2. Axle — is part of — Armillary sphere. The celestial axis.
3. Step 3. Armillary sphere — uses — Euclidean geometry. The rings model the celestial circles.
4. Step 4. Euclidean geometry — is used in — Shukhov Tower. The hyperboloid is assembled from straight bars.
5. Step 5. Shukhov Tower — has part — Antenna. A radio tower.
6. Step 6. Antenna — is part of — Router. Antennas.

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