Blank coin disc and electric motor: what they have in common

1. Step 1. Blank coin disc — is part of — Coin. A metal blank.
2. Step 2. Coin — is made of — Gold. The first Lydian coins were made of electrum, an alloy of gold and silver.
3. Step 3. Gold — is material for — Fountain pen. Expensive nibs are gold: it does not corrode and flexes softly.
4. Step 4. Fountain pen — uses — Ink. Ink.
5. Step 5. Ink — is used in — Printer. It prints with ink.
6. Step 6. Printer — has part — Electric motor. Motors move the paper and the head.

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