Mass is the where as depth is the
a.
(1) effect or degree of bulk, density, or weight a 2-dimensional form; (2) area of dark created when an object blocks light
b.
(1) effect or degree of bulk, density, or weight a 3-dimensional form; (2) apparent distance from front to back in a piece of artwork
c.
(1) effect or degree of bulk, density, or weight a 3-dimensional form; (2) distance or area between, around, above, below, and within objects
d.
1) apparent distance from front to back in a piece of artwork; (2) effect or degree of bulk, density, or weight a 2-dimensional form

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !

eugene boudin greatly inspired claude monet's art.