what? before it was gold? did you change it?
I think it 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.
i'll admit to not knowing what a nota circle is.. please enlighten me! :D
Put a circle of something else around it, it makes it look like nota circle.