Not Everyone Will Get It
Poems without a definite meaning tend to engage a reader's attention more than those that can be clearly understood and analyzed by the intellect. Ambiguous poetry has a mystery that fascinates.
Consequently, a poem about an impression, a mood or a feeling works better and is more profound if it is not immediately understandable on a rational level. In other words, there is a distinct inverse ratio between comprehension and enchantment. If a poem has a mystery or obscurity that defies any final understanding of its message and significance, then in my estimation it exerts a strong charm and is in its own way a highly satisfying artistic achievement.
Ambiguous poems need not always be a lyric or a ballad, which tend to focus on a single emotional state. Narrative poems, too, can possess some ambiguity about the events or circumstances, such as the case in Poe's "The Raven." I derive a greater pleasure from this type of narrative poem because I can go back to it again and again and read it with further speculation and new insights.
Layers of meaning
Poems without a clear-cut idea offer us multiple layers of meaning, and as we grow and mature in our wisdom and experience we can always discover deeper truths in them
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"A thing which is present can be invisible, hidden by what it shows." - René Magritte
Rock on by Tanya Johnston