Scissors and router: what they have in common

1. Step 1. Scissors — has part — Pivot joint. A screw axle.
2. Step 2. Pivot joint — is part of — Compasses. The pivot of the opening.
3. Step 3. Compasses — is used in — Euclidean geometry. Constructions with compass and straightedge.
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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