Why might a museum floor painted with Op Art be confusing to walk on? It always creates actual depth or movement.

It always has tessellations.

It can create the illusion of depth or movement.

It must be drawn with contour lines.

It can create the illusion of depth or movement

Explanation:

op art can make it look like there is a hole in the ground, there a bump, etc. even if it is flat it create OPtical illusions, making it look weird and squiggly

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 !