Nature attains equilibrium by offsetting the influences of contrasts through repetition of things that are alike. In nature the ends or extremities of all things are necessarily complementary to each other and usually seem to exist in the form of a positive and a negative. This is the principle of opposition that creates drama. Drama means a balance and a sense of unity to our work through a mixture of harmony and contrast. Where there is form there is unity.
Unity requires the like and the unlike.
It allows us to provide for change and repetition with embellishments. A form is most vital and dramatic when the contrasts are more divergent. Dominance is the major way in which we convey the thematic statements of our work. It is the extension of the chief characteristic element of the production. As we begin work on a production, we all need to understand what the playwright's goals and thematic statements are, as well as what it is that the director wishes to say or comment on, using the play as a vehicle.