Ancient bronze vessel and payment card: what they have in common

1. Step 1. Ancient bronze vessel — is part of — Zhang Heng’s seismoscope. A hull.
2. Step 2. Zhang Heng’s seismoscope — is made of — Bronze. A bronze vessel.
3. Step 3. Bronze — is material for — Catheter. The Greeks and Romans made them of bronze.
4. Step 4. Catheter — is made of — Polyvinyl chloride (PVC). Plastic catheters.
5. Step 5. Polyvinyl chloride (PVC) — is material for — Payment card. The card is PVC.

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