Poetic Diction
A subject about which he wrote his B.Litt thesis at Oxford and which led (in 1928) to his third published book, Barfield did not depart in his basic use of the term from its consensus meaning, defining it as "When words are selected and arranged in such a way that their meaning either arouses, or is obviously intended to arouse, aesthetic imagination" (PD XXX). Barfield's deeper understanding of poetic diction, however, involved such factors as felt change of consciousness and strangeness.
See in particular Poetic Diction, passim, "Poetic Diction and Legal Fiction" (RM 44-64).