Explain how Poe(the author) undermines rationality in the story.

The fall of the house of Usher.
Hi,

So, what are your ideas on this?

Best wishes, Clive
I dont understand wha tit means by saying...."Undermines rationality"
Students: We have free audio pronunciation exercises.
It is an essay topic.

I jsut dont understand what "undermines rationality" means.
It means that rationality (the observing of the world from a sane-mind point of view Emotion: stick out tongue) is left apart. The things I remember from the book tell me that it was a quite surrealistic story, whith occurrences that wouldn't be possible in normal life.