Wooden harness arch and greenhouse: what they have in common

1. Step 1. Wooden harness arch — is part of — Horse collar. An arch over the neck (Russian harness).
2. Step 2. Horse collar — uses — Domestication. The harness is put on a tamed horse.
3. Step 3. Domestication — is used in — Sakia. It is turned by oxen or donkeys.
4. Step 4. Sakia — is used in — Irrigation. Sakias in Egypt and India.
5. Step 5. Irrigation — is used in — Greenhouse. Watering plants.

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