The author of Perfume decided to create a main character with a "super sense" of smell, officially known as "Hyperosmia". Why, do you think, the author chose this particular sense rather than that of touch, hearing, taste, or vision?
"We are in, fact, chemistry"
"And scent entered into their very core, went directly to their hearts, and decided for good and all between affection and contempt, disgust and lust, love and hate. He who ruled scent ruled the hearts of men" - Perfume
"This scent was inconceivable, indescribable, could not be categorized in any way - it really ought not to exist at all. And yet there it was as plain and splendid as day” -Perfume