Plastic brick shell and heron’s aeolipile: what they have in common

1. Step 1. Plastic brick shell — is part of — LEGO bricks. A thin-walled ABS plastic shell.
2. Step 2. LEGO bricks — uses — Elasticity. The grip relies on the elastic deformation of the plastic.
3. Step 3. Elasticity — is used in — Spring. A spring works through the elasticity of its material.
4. Step 4. Spring — is part of — Vending machine. A spring holds the dispenser.
5. Step 5. 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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