In 1975, young George Lucas purchased several pieces of Berkey's sci-fi artwork, which served him as visual reference material while he was trying to pitch his ideas to film studios for a new space fantasy film...
Among those pictures was one of a rocket-plane diving down through space towards a gigantic mechanical planet. This image had been used as cover art for the 1972 reprint of the short story anthology Star Science Fiction Stories No. 4 https://en.wikipedia.org/wiki/John_Berkey#cite_note-tributes-11…
Really interesting. Reminded me of an article I read about Googie architecture, which was the 60s rush for the spaceage vibe. Dug it out, might be of interest :