The Songs of Eretz MOOC ModPo Poem of the Day for September 10, 2014 is "The Brain, within its Groove" by Emily Dickinson. A link to the poem may be found here: http://www.writing.upenn.edu/~afilreis/88v/ed556.html. Dickinson's poetry has been examined many times in the Poetry Review. A brief biography and references may be found here: http://eretzsongs.blogspot.com/2013/12/review-of-its-all-i-have-to-bring-today.html.
"The Brain, within its Groove" is another Dickinsonian ballad--this a straightforward traditional one that might have been composed by Wordsworth over a century earlier. The message, too, I think, is pretty straightforward. She posits that once a thought intrudes upon the brain, it is impossible to resume the previous train of thought--the old "trying not to imagine an elephant" phenomenon.
Straightforward though this poem may be, there are several playful elements worth mentioning. "Groove" implies a track, as for a train, as for a train of thought. Also, the brain is made up of grooves anatomically--something Dickinson may have known. She also plays with "Splinter" which suggests an intrusive thought and, literally, a splinter of wood, as in the wooden "Turnpike" in the second stanza. "Current" has both literal and metaphorical meanings: literally a rushing body of water; metaphorically, current may refer to the current of thought or the electrochemical mode of communication within the brain--another bit of science that Dickinson might have known. "Floods" has similar literal and metaphorical meanings--a flood of water, and a flood of thoughts.