Padlock body and monitor: what they have in common

1. Step 1. Padlock body — is part of — Padlock. A case with the mechanism.
2. Step 2. Padlock — has part — Spring. The mechanism’s springs.
3. Step 3. Spring — is part of — Pinball. A plunger.
4. Step 4. Pinball — evolved into — Arcade machine. Coin-operated entertainment.
5. Step 5. Arcade machine — has part — Cathode-ray tube. A CRT monitor.
6. Step 6. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.

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