Answer:
a. the interior of the house has a very ghostly and dark atmosphere, with little light reflections.
B. Usher's mental condition is deteriorating, he seems to be falling apart and gradually ending up like the house, which seems to be decomposing. Their appearance reveals this.
Explanation:
In "The fall of Usher's house" we are first introduced to the house. The house stands out from the environment around it, it looks like something that doesn't fit in the real world. This is because it has a ghostly, decadent appearance, with tones of madness and terror, its interior is as decadent and unreal as its exterior, besides having a dark atmosphere with little incidence of light.
Its owner, Usher, is in a mental condition that matches the appearance of the house. He has symptoms of paranoia, madness and confusion, it is as if he too is slowly deteriorating.
