Harpsichord and oil lamp: what they have in common

1. Step 1. Harpsichord — has part — Keyboard. A keyboard.
2. Step 2. Keyboard — is part of — Linotype. A keyboard.
3. Step 3. Linotype — evolved from — Movable type. Mechanized typesetting.
4. Step 4. Movable type — is made of — Clay. Bi Sheng’s type was made of fired clay.
5. Step 5. Clay — is material for — Oil lamp. Later — clay ones.

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