Both L. Frank Baum and Hugh Lofting tried to do the same thing: Lofting by sending Dr. Doolittle to the moon in Dr. Doolittle in the Moon, and Baum by having Oz magically made invisible to the outside world after a failed invasion in The Emerald City of Oz. It didn't work either time. In fact Baum didn't even get out of writing more Oz books by dying!