Hat band ribbon and heron’s aeolipile: what they have in common

1. Step 1. Hat band ribbon — is part of — Hat. A band at the base of the crown.
2. Step 2. Hat — is made of — Felt. Felt.
3. Step 3. Felt — is material for — Piano. The hammers are covered with felt.
4. Step 4. Piano — has part — Lever. The hammer action is a system of levers.
5. Step 5. Lever — is part of — Vending machine. A coin presses a lever that opens the dispenser.
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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