Leather bellows bag y Imprenta de Gutenberg: qué tienen en común

1. Paso 1. Leather bellows bag — forma parte de — Fuelle. It changes volume when squeezed.
2. Paso 2. Fuelle — forma parte de — Pianola. Pedal bellows create suction.
3. Paso 3. Pianola — funciona como — Telar Jacquard. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.
4. Paso 4. Telar Jacquard — funciona como — Imprenta de Gutenberg. 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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