Balance wheel and greenhouse: what they have in common

1. Step 1. Balance wheel — is part of — Pocket watch. The balance wheel with its hairspring sets the frequency.
2. Step 2. Pocket watch — has part — Escapement. The lever escapement links the balance and the wheel train.
3. Step 3. Escapement — is part of — Tower clock. An escapement sets the pace.
4. Step 4. Tower clock — is part of — Gothic cathedral. A tower clock.
5. Step 5. Gothic cathedral — has part — Window glass. Stained glass.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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