Harness traces and kite: what they have in common

1. Step 1. Harness traces — is part of — Horse collar. Straps to the shafts.
2. Step 2. Horse collar — is used in — Cart. The horse collar let horses pull heavy carts.
3. Step 3. Cart — has part — Axle. The wheels turn on an axle.
4. Step 4. Axle — is part of — Yo-yo. The axis between the discs.
5. Step 5. Yo-yo — has part — Rope. A thread.
6. Step 6. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.

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