I felt a Cleaving in my Mind −
As if my Brain had split −
I tried to match it − Seam by Seam −
But could not make them fit.
The thought behind, I strove to join
Unto the thought before −
But Sequence raveled out of Sound
Like Ball − upon a Floor.
“Like Ball” suggests a metaphor of a ball of yarn. When the yarn is not unraveled, it symbolizes the stability in one’s mind to think and put the thoughts together. When it is unraveled, it signifies the mental instability of the speaker, implying over thinking and a mental breakdown. This connects to the mourning of a lost one in that after losing someone special, one starts to feel a void. After the speaker loses someone close, he/she needs to learn how to live without that person. This is the moment when the speaker looks for transformation, acceptance, and enlightenment, but instead breaks down because there is no way to fill such a gap. 

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