The octave on the guitar
12 semitones · P8 · C → C
Its character, in the app's words: return; an octave wider (P15), wholeness: the arrival becomes unity.
The shapes on the neck
- On the same string: 12 frets up.
- On the next string, towards the 1st: 7 frets up; 8 frets up when you cross from the G string to the B string, which are tuned a major 3rd apart instead of a 4th.
The root is the C on the A string, 3rd fret; the other circles are the same note, C, wherever it sits between frets 0 and 12. The 1st string (high e) is at the top, as in the app. The root is filled.
Open it in the app: 2. Intervals
The other intervals