High-speed train and heron’s aeolipile: what they have in common

1. Step 1. High-speed train — has part — Bogie. Bogies with suspension.
2. Step 2. Bogie — has part — Spring. Spring suspension.
3. Step 3. Spring — is part of — Vending machine. A spring holds the dispenser.
4. Step 4. Vending machine — was inspired by — Heron’s aeolipile. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.

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