147. The sequences of the Diagonal fall into two divisions. First, there are the sequences which we draw through the [Diagram of Values and Colors] from Black up-to-the-right to White. I shall call these the Sequences of the Right Mode (Sign ⍁). Second, there are the sequences which we draw from Black up-to-the-left to White. I shall call these the Sequences of the Left Mode (Sign ⍂).
Taking the lowest color in the sequence as the keynote, we have for the Right Mode, in the Scale of Twelve Colors, twelve distinct sequences of which this which follows is an example.
| Seq. LD-BV, ⍁ 2ds | ||
| Wt | ||
| HLt | - | OY |
| Lt | - | O |
| LLt | - | RO |
| M | - | R |
| HD | - | VR |
| D | - | V |
| LD | - | BV |
| Blk | ||
In this sequence the colors are taken at the interval of the second. That is what is meant by the abbreviation 2ds.
Taking the lowest color of the sequence as its keynote, as before, we have for the Left Mode twelve distinct sequences, of which that which follows is an example.
| Seq. LD-OY, ⍂ 2ds | ||
| Wt | ||
| HLt | - | BV |
| Lt | - | V |
| LLt | - | VR |
| M | - | R |
| HD | - | RO |
| D | - | O |
| LD | - | OY |
| Blk | ||
In this sequence, as in the one previously given, the colors are taken at the interval of the second.
148. The colors in these diagonal sequences may be taken not only at intervals of the second, but at intervals of the third, the fourth, the fifth, the sixth, and the seventh. Taking the colors at these different intervals we have, for each interval, twenty-four distinct sequences; twelve for the Right Mode, twelve for the Left Mode; in all one hundred and forty-four different sequences.
149. Among the sequences of the Diagonal those in which the colors are taken at the interval of the fifth are particularly interesting. The colors taken at the interval of the fifth fall into four triads,—the first, R-Y-B, the second, RO-YG-BV, the third, O-G-V, the fourth, OY-GB-VR. Taking the colors in any of these triads in the two modes, the Right and the Left, we get six sequences of different colors in different values for each triad. Of these Triad-Sequences I will give one as an example.
| Seq. LD-R, ⍂ 5ths | ||
| Wt | ||
| HLt | - | R |
| Lt | - | Y |
| LLt | - | B |
| M | - | R |
| HD | - | Y |
| D | - | B |
| LD | - | R |
| Blk | ||