His manner atthese moments was frigid and abstract; his eyes were vacant in expression; whilehis voice, usually a rich tenor, rose into a treble which would have soundedpetulantly but for the deliberateness and entire distinctness of the enunciation
I feel like the analytic ability of Dupin could be related to modernist or realist art. It seems as though he is so analytical and notices the little things that he sees all of life in a realist (simplistic) way, even if a situation is hard to decipher and details usually go unnoticed, such as a modernist painting or the situation of the murder later on in the story. I think when living in a city, there is a higher degree of analytic ability people have just from naturally seeing so many details around everything almost every second of the day.