Impressionist music used a technique that was the opposite of harmony and that used disagreeable sounds. this technique was known as
melody
atonality
dissonance
syncopation

the correct answer for this question is:

it is system invented in 1872 that produced the first illusion of movement. basically it was a disk with a series of drawings around the edge, showing the same object in slightly different poses. when it was spun, it created the illusion of movement.

found this online : )