What is the relation between the language being heard and the picture being exhibited on the stage ? Typically there is an identity between sound and sight, but often there is a divergence between what the audience hears and what it sees.

What is the relation between the language being heard and the picture being simultaneously exhibited on the stage? Typically there is an identity between sound and sight, but often there is a divergence between what the audience hears and what is sees. These divergences are 'insets' and examines the motives, mechanics and poetic qualities of these narrative poems embedded in the plays.