The primary pigment of poetry is the IMAGE.
Poetry is a very complex art.... It is an art of pure sound bound in through an art of arbitrary and conventional symbols.
In verse one can take any damn constant one likes, one can alliterate, or assone, or rhyme, or quant, or smack, only one MUST leave the other elements irregular.
Poetry must be as well written as prose.
To break the pentameter, that was the first heave