Final answer:
Hamlet's speech reveals a complex theme of inexpressible emotion towards his mother's actions, reflecting Shakespeare's own struggle with representing such deep feelings.
Step-by-step explanation:
Hamlet's speech beginning "Seems, madam? Nay it is" in act I points to a theme which involves the profound and inexpressible emotion Hamlet feels towards his mother's actions, and his struggle to find an objective equivalent to express this emotion.
The complexity of Hamlet's feelings is too great for the facts as they appear, causing him a sense of bafflement and disgust that exceeds the character of Gertrude and prevents him from taking decisive action.
This theme also reflects Shakespeare's own artistic struggle to convey a feeling that lacks a clear external representation within the play.