I felt a Funeral, in my Brain

 "Kept treading-treading-till it seemed That Sense was breaking through-..."


An important sense evoked in this poem is touch.  Touch is evoked by use of the words "treading," "Drum," and "beating."  The author utilizes the sense of touch to re-create the sense of immense mental  pressure that is felt in the speaker descending into insanity.  I thought it was interesting to see mental, abstract pressures being embodied in a physical form by the feet and drum in a dark funeral. Pressure and touch are ultimately used to characterize the precise moment in which the speaker enters mental insanity.  The speaker's "Plan in reason" gave way do to the merciless pressure being exerted.  This means that the mental turmoil within the speaker was under so much strain that it snapped, and the ability to function normally is lost.