Metaphor?

Some believe Gregor Samsa's external change is a metaphor for an internal change he has experienced. Looking back at chapter one, what evidence within the text supports this idea? What, then, has changed for Gregor internally?

Insanity Plea?

Some readers of The Matamorphosis have proposed that Gregor is actually insane and only believes that he has transformed into an insect. Evaluate this interpretation by providing specific evidence in the text that substantiates this claim.

Style

Russian author Vladimir Nabokov once commented that the straightforward stle of The Metamorphosis is in "striking contrast to the nightmare of the tale." Look back at Kafka's writing style and, with Nabokov's statement in mind, explain how the style enhances the nightmarish quality of the work.