Why do certain poems work?

How do certain poems evoke emotion in others? My favorite poems posess space and silence, or juxtapose ordinary words to encapsulate something inexpressible.

For example, the surrender of one person to another expressed without mentioning the word 'surrender' or 'yield', but rather describing it by using an extended metaphor and then a simile in e.e. cumming's poem, Somewhere I Have Travelled:

Or if your wish be to close me, ['Close me'; so harsh]
i and my life will shut [Using 'my life' really drives home the extent of the yielding]
very beautifully, suddenly, [Grace, willingness]
as when the heart of this flower imagines the snow [Not knowing, but imagining; why?]
carefully everywhere descending;

What touches me in this way that I can simply state what the emotion is so full and deep that it simply spills out of my mouth or through my pen without in this seemingly effortless way?

A Place for Writing

Here I plan to create my new space for poetry and writing. I don't want to lay out any specific plans for what I hope arises here, but I plan to explore my own propensity for poetry/ and discuss my own love for poetry/writing.