Ivan Wyschnegradsky, Prelude No. 14, mm. 1-2
The boxed intervals are all minor fifths, although quite a few of them are spelled as fourths. For some reason, Wyschnegradsky prefers enharmonic equivalents to avoid spelling pitches with a three-quarter-flat accidental.
Collectively, the notes in the boxes make up a single tetrachord, and it is this tetrachord that I consider analogous to the tonic triad in conventional tuning.