niche (noun) -a recess in a wall especially for a statue. like a hidden private area.

i found this definition on  https://www.merriam-webster.com/dictionary/niche

i found this word in passage “A Rose for Emily”
by William Faulkner.

“she had evidently shut up the top floor of the
house–like the carven torso of an idol in a niche, looking or not looking
at us, we could never tell which.”

Niche is overall a shadow or indent in a wall that is able to hold something. usually used for flowers, picture frames, statues and more.

Now knowing the the definition i can better understand what they are trying to say. usually what ever is in a niche is trying be focused on and thats where all the attention is.