Stent and mechanical clock: what they have in common

1. Step 1. Stent — is made of — Stainless steel. Stainless steel or nitinol.
2. Step 2. Stainless steel — is material for — Fountain pen. The nib of a modern fountain pen is stainless steel.
3. Step 3. Fountain pen — is made of — Gold. Expensive nibs are gold: it does not corrode and flexes softly.
4. Step 4. Gold — is material for — Wristwatch. The case is gold or silver.
5. Step 5. Wristwatch — is a kind of — Mechanical clock. A wristwatch is a mechanical clock made small enough to wear.

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