Violin bow and CNC machine: what they have in common

1. Step 1. Violin bow — is part of — Violin. The friction of horsehair excites the string.
2. Step 2. Violin — uses — String vibration. Vibrating 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 — uses — Program control of a machine. The tune is recorded on a perforated roll.
6. Step 6. Program control of a machine — is used in — CNC machine. The tool’s movement is set by a program — at first on punched tape.

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