it sat and it watched him silently as a voice radiating from nowhere in particular , seemingly wrapped in the winds of the karakaze , went on in drawn-out tones : sound waves , regardless of their frequency or intensity , can only be detected by the mole flys acute sense of smellit is a little known fact that the mole flys auditory receptors do not , in fact , have a corresponding center in the brain designated for the purposes of processing sensory stimuli and so , these stimuli , instead of being siphoned out as noise , bypass the filters to be translated , oddly enough , by the part of the brain that processes smell .