It is because of the notes that aren’t depicted, that the context, choreography, and hierarchy of importance can be defined within the succinct clarity of a rigid diatonicism.
A myriad of harmonic movements may be the ever changing sea that these notes might be undulating with, against; purposefully or by intuition or happenstance; afloat or diving with and through these harmonic waves in this nautical vessel of melody.
This seemingly chaotic drama cadences momentarily when the vessel synchronizes with the motion, arcs, and varying shapes of these ever changing waves.
Melody and Harmony can be in a constant relationship of change and metamorphosis, negotiated within the context of their mutual (however, not exclusive) physical laws of function.