Clock dial and shaduf: what they have in common

1. Step 1. Clock dial — is part of — Tower clock. Large dials on the faces of the tower.
2. Step 2. Tower clock — is part of — Gothic cathedral. A tower clock.
3. Step 3. Gothic cathedral — has part — Window glass. Stained glass.
4. Step 4. Window glass — is part of — Greenhouse. It lets light in and holds heat.
5. Step 5. Greenhouse — uses — Irrigation. Watering plants.
6. Step 6. Irrigation — uses — Shaduf. The shaduf fed water into the canals.

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