Leather bellows bag and gutenberg printing press: what they have in common

1. Step 1. Leather bellows bag — is part of — Bellows. It changes volume when squeezed.
2. Step 2. Bellows — is part of — Player piano. Pedal bellows create suction.
3. Step 3. Player piano — works like — Jacquard loom. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.
4. Step 4. Jacquard loom — works like — Gutenberg printing press. 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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