Antikythera mechanism and greenhouse: what they have in common

1. Step 1. Antikythera mechanism — has part — Gear. The mechanism contains at least 30 bronze gears.
2. Step 2. Gear — is part of — Tower clock. A gear train drives the hands.
3. Step 3. Tower clock — is part of — Gothic cathedral. A tower clock.
4. Step 4. Gothic cathedral — has part — Window glass. Stained glass.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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