The majority of the poems posted in Damian's
Short Poems thread are jokes in verse--good ones. Clearly, making jokes is something short poems can do well.
The other poems (those, for instance, by Lawrence, Pound, Okri, Welch, Crane, Kristallo, and Dickinson) also strike me as light verse,
verse whose primary appeal is intellectual, though I may misunderstand the appeal to most readers of haiku/senryu and poems that operate in a similar mode, like the posted Pound poem.
How long must a poem be to make a primarily emotional impact? What's the shortest poem you know that has such an impact on you? (Maybe there's one in Damian's thread or at his blog that does this for you.)