This notion of fitness & the imaginative grasp of the "whole image": relates to Wallace Stevens (drawing on IA Richards' version of Coleridge on Imagination) in Notes Toward a Supreme Fiction, "It Must Be Abstract" (ie. the poem is an imaginative whole, an "abstracted" image of reality). Mandelstam, somewhere: "Acmeism loves 'the idea of Man' more than men themselves." (quoting from memory) Mandelstam is not saying that the acmeist is either inhumane or naively idealistic. He's saying that reality is grounded in a beautiful concept. In another place (in a poem) he put it something like this: "It's not Rome, the city, which endures through the ages: it's Man's place in the universe." (cf. Stevens' "the McCullough", or "Major Man".)