In music theory, the circle of fifths (or circle of fourths) is a visual representation of the relationships among the 12 tones of the chromatic scale, their corresponding key signatures, and the associated major and minor keys. More specifically, it is a geometrical representation of relationships among the 12 pitch classes of the chromatic scale in pitch class space. http://en.wikipedia.org/wiki/Circle_of_fifths

With the above in mind I created Mehdi Kaleidoscope guitar with all the settings at 5 using Mirror Effect.

Guitar-Luthier Steve Kauffman, Lafayette CA : http://kauffmanguitars.com/