What a Piece of Work Is a Man: Mechanical Gods in the Fiction of Roger Zelazny
Yoke, Carl B. "What a Piece of Work Is a Man: Mechanical Gods in the Fiction of Roger Zelazny." TMG -74. 
Deals primarily with the Bork in "The Engine at Heartspring's Center," John Auden in "The Man Who Loved the Faioli," Jarry Dark in "The Keys to December," the "gods" in Lord of Light, Frost in "For a Breath I Tarry," the Hangman in "Home Is the Hangman" (see Zelazny entries under Fiction).