Mayakovsky has an essay called How to Write Poems where he says that a poet must spend time and effort choosing the uniquely appropriate words, force them into the rhythm of the poem and then test it out loud ten times or more. Vertov did something very similar at the editing table. A hundred tests, a thousand different variants, endless numbers of try-outs--for meaning, for imagery, for rhythm--and finally, after long intensive efforts, that feeling of joy: it works. . .