Chrominicism
The unlimited string of fifths introduces a natural relative flatness/sharpness phenomenon that is at the root of musical intuition. Called Chrominicism, this phenomenon is a form of mini Chromaticism, measured in notches of 1/7th (0,142857) of a semi-tone, or 1/84th of an octave (7x12), rather than in semi-tones.

Series
Other clips in the "Harmony Basics" series also describe other fascinating manifestations of Chrominicism.