The tone of a poem may be affectionate, hostile, sarcastic, etc. An allusion serves to enrich the poems meaning by evoking relevant associations. It may also be an odor or a taste or a bodily sensation such as pain, thirst, or coldness. In this way the poem works on the imagination rather than on the intellect. A simile is used to clarify, define or describe an unknown in terms of something familiar.
Alliteration is used for the pleasure of the repetition and to produce emphasis.
A Deluding my confusion is both lucrative and prudent. Form includes such elements as meter, rhyme, line, syntax, and overall spatial arrangement of the words. Open Form requires no set pattern, rather the poet creates the form out of the poem itself. Most American poets today prefer open form to closed.