Scissor blades and jacquard loom: what they have in common

1. Step 1. Scissor blades — is part of — Scissors. Two crossing blades.
2. Step 2. Scissors — has part — Pivot joint. A screw axle.
3. Step 3. Pivot joint — is part of — Compasses. The pivot of the opening.
4. Step 4. Compasses — is used in — Mercator projection. The map grid was built with compasses and a ruler.
5. Step 5. Mercator projection — uses — Gutenberg printing press. Maps were printed in large numbers.
6. Step 6. Gutenberg printing press — works like — Jacquard loom. An analogy, not proven influence: both set type and a chain of punched cards are a replaceable pattern that a machine reproduces over and over.

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