Guitar tuning pegs and gutenberg printing press: what they have in common

1. Step 1. Guitar tuning pegs — is part of — Guitar. Tensioning and tuning the strings.
2. Step 2. Guitar — uses — String vibration. Strings.
3. Step 3. String vibration — is used in — Piano. Strings.
4. Step 4. Piano — includes — Player piano. A piano.
5. Step 5. Player piano — works like — Jacquard loom. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.
6. Step 6. 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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