Question: During what decade did J.R.R. Tolkien use mythopoeia in his literary works?
Sentence (from "Mythopoeia"): Mythopoeia (also mythopoesis, after Hellenistic Greek μυθοποιία, μυθοποίησις "myth-making") is a narrative genre in modern literature and film where a fictional or artificial mythology is created by the writer of prose or other fiction.
Relevant evidence: No