 Their father is away and their mother is ill, as is the case with Digory.They also manage to transport the queen of ancient Babylon to London and she is the cause of a riot; a very similar event takes place in "The Magician's Nephew" when Polly and Digory transport Queen Jadis to London and she also causes a similar disturbance.The creation of Narnia may also have been influenced by his close friend J. R. R. Tolkien's "The Silmarillion", which also contains a creation scene driven by the effect of music.