The spectator in the audience, however, does experience more than merely the light and sound sensations which fall on the eye and ear at that moment.

He may be entirely fascinated by the actions on the stage and yet his mind may be overflooded with other ideas.

Only one of their sources, but not the least important one, is the memory.
Indeed the action of the memory brings to the mind of the audience ever so much which gives fuller meaning and ampler setting to every scene--yes, to every word and movement on the stage.

To think of the most trivial case, at every point of the drama we must remember what happened in the previous scenes.

The first act is no longer on the stage when we see the second.