Paper money and kiln: what they have in common

1. Step 1. Paper money — uses — Woodblock printing. Printed from blocks.
2. Step 2. Woodblock printing — evolved into — Movable type. Bi Sheng replaced the solid block with individual pieces of type.
3. Step 3. Movable type — is made of — Clay. Bi Sheng’s type was made of fired clay.
4. Step 4. Clay — is material for — Kiln. Kilns were built of clay.

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