Wooden stand and sickle: what they have in common

1. Step 1. Wooden stand — is part of — Armillary sphere. A support with a horizon.
2. Step 2. Armillary sphere — has part — Axle. The celestial axis.
3. Step 3. Axle — is part of — Cart. The wheels turn on an axle.
4. Step 4. Cart — uses — Horse collar. The horse collar let horses pull heavy carts.
5. Step 5. Horse collar — uses — Domestication. The harness is put on a tamed horse.
6. Step 6. Domestication — uses — Sickle. Harvesting wild cereals with sickles.

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