Music box and heron’s aeolipile: what they have in common

1. Step 1. Music box — has part — Mainspring. A mainspring turns the cylinder.
2. Step 2. Mainspring — is part of — Pocket watch. The mainspring stores the energy.
3. Step 3. Pocket watch — is a kind of — Mechanical clock. A portable mechanical clock.
4. Step 4. Mechanical clock — is part of — Parking meter. A clock mechanism.
5. Step 5. Parking meter — evolved from — Vending machine. A payment machine.
6. Step 6. 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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