Dental filling and screw press: what they have in common

1. Step 1. Dental filling — is made of — Silver. Silver in the amalgam.
2. Step 2. Silver — is material for — Coin. Silver coins.
3. Step 3. Coin — uses — Coining (die stamping). The image is applied with a blow of a die.
4. Step 4. Coining (die stamping) — is used in — Cylinder seal. A seal reproduces the same image many times.
5. Step 5. Cylinder seal — works like — Gutenberg printing press. An analogy: both a seal and a press reproduce a pre-carved pattern.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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