These two modes, which are mirror image to each other and are also transpositions of each other, are created by dividing the octave into four equal parts and adding an interval of either half a step or a whole step to each resulting note. As such, they are both symmetric scales and are used in diminished context, albeit in a different manner. They are also the result of superimposing two diminished seventh chords set either half a step or a whole step from each other.