Pocket watch and elevator: what they have in common

1. Step 1. Pocket watch — has part — Escapement. The lever escapement links the balance and the wheel train.
2. Step 2. Escapement — is part of — Tower clock. An escapement sets the pace.
3. Step 3. Tower clock — is part of — Gothic cathedral. A tower clock.
4. Step 4. Gothic cathedral — works like — Steel frame. A skeleton system: the frame carries the load, freeing the walls for windows.
5. Step 5. Steel frame — is part of — Skyscraper. A steel frame.
6. Step 6. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.

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