Hughes
Let us first examine the meeting of the key-notes and their trinities in musical clef; the isolated fourths rising through the progression of the twelve now meet, seven and seven pairing. We must notice how closely they are linked into each other, the three highest notes of the lower seven being the three lowest of the higher seven an octave higher, and the four lowest becoming the four highest an octave higher; we descend by following the keys as written in musical clef upwards. [Harmonies of Tones and Colours, Diagram XIV - The Modulating Gamut of the Twelve Minor Keys by Fifths1, page 39]

See Also

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11.13 - Dominant Conditions are Mated Opposing Pairs as Fifths
bidirectional wave pair
carbon pair
centripetal pair
complementary pair
complementary pairs
cooper pair
divided and extended pairs
divided electric pairs
divided pairs
doctrine of three pair and six tones
electrically divided pair of moving lights
Figure 15.05 - Nine Pairs of Gravity Poles
Figure 2.1.5 - Russells Rings forming Spheres from Three Pairs of Reflecting Mirrors
five pairs
four pairs
four pairs of cones
four pairs of projecting rings
four pairs of tones
mate-pairs
moving pairs
octave pairs
octave pairs of rings
pair
pair of fifths
pair of gravity points
pair of points
pairs of gravity points
pairs of opposition
pairs of ring units
pairs of spinning rings
pairs of tones
projected light of spectrum pairs
sex-conditioned pairs
sexed pairs
thirteen pairs
unit pairs
united fourth pair
united pair
united pairs of rings
universal division of sexed pairs
wave pair