Ferris wheel and fitness tracker: what they have in common

1. Step 1. Ferris wheel — has part — Spoke. Tension spokes — as in a bicycle wheel.
2. Step 2. Spoke — is part of — Wheelchair. Spoked wheels.
3. Step 3. Wheelchair — has part — Hub motor. Powered wheelchairs.
4. Step 4. Hub motor — is part of — Electric unicycle. A hub motor.
5. Step 5. Electric unicycle — has part — Accelerometer. Tilt sensors.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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