This is a general category, but currently all or most of its content is in the MTBR image set.
Circle of triads (24-gon in 7 octaves) Circle of diminished triads (4-gon in 1 octave)
Circle of short inverted triads (6-gon in 2 octaves) Circle of long inverted triads (8-gon in 3 octaves) Circle of inverted diminished triads (8-gon in 3 octaves)
Scale circle in thirds (7-gon in 2 octaves)
Scale circle of inverted triads (14-gon in 5 octaves)
