So, while it is vibrating to and fro, the string does not just act as one long string swingingbackwards and forwards at the fundamental frequency. It is involved in a complicated, wiggling dance which encompasses lots of vibrations happening at the same time – in the same way that the rapid, small wiggles of the swing chains were superimposed on the overall gentle swinging of the chain. The ‘whole string’ movement of the guitar string will be accompanied by some ‘half string’, ‘third string’ and ‘quarter string’ vibrations (and others).