Adding to the Scale
Some of music's greatest moments have been total mistakes. Mistakes in fingerings of chords can lead to interesting and unusual chord shapes. While you were practicing the pentatonic scale, maybe you hit a wrong note—a note that was outside of the scale shape you were supposed to play. What if that note didn't sound bad at all? What if you really liked that note? Some disciplined students would just correct the mistake and move on to the “real” scale. Others would morph the original scale and add the “happy accident” to the scale and create an entirely new scale.