I am not an instrumentalist!
String harmonics can be played much more brightly than in this video but I produced it in order to clarify that the harmonics arise from the sweet spots where the string is divided by an integer ratio. If the string is touched gently at these points a node will have its place. The fundamental here is an E of about 84 Hz, but that is really not so important.
The colour code (which does not need to be interpreted symbolically) is as follows:
White:
Octaves, partials # 2, 4 and 8, corresponding to 1/2; 1/4 and 1/8 of the string length respectively and to 2; 4 and 8 times the fundamental frequency.
Red:
Perfect fifths, partials # 3 and 6, corresponding to 1/3 and 1/6 of the string length respectively and to 3 and 6 times the fundamental frequency.
Yellow:
Just Major Third, partial # 5, corresponding to 2/5 and 1/5 of the string length and to 5 times the fundamental frequency.
Blue:
Septimal Minor Seventh, partial # 7, corresponding to 1/7 of the string length and to 7 times the fundamental frequency.
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