Euclidean geometry and joystick: what they have in common

1. Step 1. Euclidean geometry — is used in — Shukhov Tower. The hyperboloid is assembled from straight bars.
2. Step 2. Shukhov Tower — has part — Antenna. A radio tower.
3. Step 3. Antenna — is part of — Pager. It receives the signal with an antenna.
4. Step 4. Pager — has part — Vibration motor. Vibrating alert.
5. Step 5. Vibration motor — is part of — Gamepad. Vibration.
6. Step 6. Gamepad — evolved from — Joystick. A game controller.

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