Magic lantern and screw press: what they have in common

1. Step 1. Magic lantern — uses — Oil lamp. The light source is an oil lamp.
2. Step 2. Oil lamp — is made of — Clay. Later — clay ones.
3. Step 3. Clay — is material for — Movable type. Bi Sheng’s type was made of fired clay.
4. Step 4. Movable type — is part of — Gutenberg printing press. Text is set from metal type.
5. Step 5. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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