Organic form [in contrast to mechanical form] grows with the material, is present from the beginning to shape the material; starts out as a kind of germ, or seed, from which the work unfolds. It is this concept of form by which all the great poets have written; and as to theory, though this idea of form was lost to us during the seventeenth century and not revived until the time of the Romantics in the l9th century, it is nonetheless this concept that Plato and Aristotle held and that shaped the imagination of the Western world. It is this concept that Coleridge and Keats espoused; that the Southern critics explored, and that Maritain develops in the work discussed here.
Cowan, Louise, "Form in Poetry" (2012). Public Lectures. 5.