Everyone in a piece of theatre from the actors, to the creative team, to the technical designers, to the audience and more work to make sure that-

hmmm, to make sure that the play goes well and according to pplan>?

Explanation:

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 : )