When one thinks of poetry it draws up an image of softness, of soothing, of calming, of elite contemplative rest. However, poetry encompasses all emotions and observances of life.
The technique of cacophony, used by poet and author Lewis Carroll in his poem "Jabberwocky" is a perfect illustration of this counter intuitive imagery style. In this verse, Carroll creates unpleasant spoken sound by using clashing consonants.
In general, it can be compared to a traffic jam, a meaningless mixture of sounds. It also appears as a cacophony of hoots, cackles, and wails.