Poems can raise questions about how things are perceived, and it is often best when they leave those questions unanswered. Simon Armitage's "Snow Joke," the first poem in his first book, Zoom!, tells a story about a man who dies when his car gets stuck in a blizzard, and concludes by addressing the question of which of the three men who found the car under the snow "was to take the most credit":

Him who took the aerial to be a hawthorn twig?
Him who figured out the contour of his car?
Or him who said he heard the horn, moaning
softly like an alarm clock under an eiderdown?

Beyond the openness of this ending, there is also the issue of the details of these perceptions and misperceptions: the aerial as a hawthorn twig; the mound of snow understood to be the contour of a car; the horn under the snow (something alarming, cold, dangerous) heard as an alarm clock under an eiderdown (something alarming, of course, but warm and unthreatening). The harmless has to be perceived as a site of harm in order for the dead man to be found. Evidence has to be seen as evidence, as sign, rather than as ... well, nothing much at all.

You can read the whole poem on this discussion page, a little ways down (where it is posted without its quatrain form).

[Warning: I have Armitage on the brain right now, as I am preparing a seminar on his work!]