Sand temper and payment card: what they have in common

1. Step 1. Sand temper — is part of — Pottery. Sand or grog so the vessel does not crack in firing.
2. Step 2. Pottery — is made of — Clay. Vessels are shaped from clay.
3. Step 3. Clay — is material for — Movable type. Bi Sheng’s type was made of fired clay.
4. Step 4. Movable type — evolved from — Woodblock printing. Bi Sheng replaced the solid block with individual pieces of type.
5. Step 5. Woodblock printing — is used in — Paper money. Printed from blocks.
6. Step 6. Paper money — evolved into — Payment card. The next form of money.

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