Hook and eye and monitor: what they have in common

1. Step 1. Hook and eye — is made of — Bronze. Medieval fasteners were bronze.
2. Step 2. Bronze — is material for — Heron’s aeolipile. The aeolipile is a bronze ball.
3. Step 3. Heron’s aeolipile — inspired — Vending machine. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.
4. Step 4. Vending machine — includes — Arcade machine. A coin-operated machine.
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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