Typography and rolling mill: what they have in common

1. Step 1. Typography — uses — Movable type. Type was cast as pieces of type.
2. Step 2. Movable type — is made of — Clay. Bi Sheng’s type was made of fired clay.
3. Step 3. Clay — is material for — Bloomery. A bloomery is a clay shaft.
4. Step 4. Bloomery — evolved into — Blast furnace. The blast furnace grew out of the bloomery.
5. Step 5. Blast furnace — is part of — Steel works. Blast furnaces.
6. Step 6. Steel works — has part — Rolling mill. Rolling mills.

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