Crop rotation and kite: what they have in common

1. Step 1. Crop rotation — uses — Plough. The three-field system with a heavy plough.
2. Step 2. Plough — uses — Wedge. The ploughshare parts the soil like a wedge.
3. Step 3. Wedge — is used in — Harpoon. A barbed point enters like a wedge and does not come back out.
4. Step 4. Harpoon — has part — Rope. A line connects the head to the hunter.
5. Step 5. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.

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