“One perception must immediately and directly lead to a further perception.” - Charles Olson, “Projective Verse”, from Selected Writings.
Olson's declaration is a good lesson to keep in mind when writing, especially as a poet. Keep the poem moving, and move it to a purpose, the writing made of perceptions. Actually, the rule could apply to any writing. Keep the thing moving. But that is what we add...we take the language we find, we add the perception, and the reader then adds their own experiences and reactions. The poem then becomes a vortex, drawing in the reader's world. So to evoke the additions, move the poem from perception to perception, “Move, instanter, on another!” as Olson said. Hard to do, certainly.