circle of 5ths
The numbers are scale degrees in C: 12=C, 7=G, 2=D, 1=C#, etc.
Not only does it make a whimsical clock face, but captures some ideas
I've been thinking about.
Take a regular keyboard, and imagine the F and B colored gray:
Now the white keys form a pentatonic scale, and the black keys form a
different one. Adding the gray keys to either gives a diatonic
In the Circle of 5ths above, the white keys on the left are the 3
adjacent keys of one of the pentatonics; the black keys are the other
two. The right half has the complementary 'pentatonic keyboard'.
Just a way to play with some of the intrinsic symmetries.