The enthusiasm for Arthurian legends did not continue into the early twentieth century, largely because of the scientific developments of the previous century. Realism was considered most important in literature and much scepticism arose about anything that did not fit within the strict boundaries of scientific knowledge that had been established. Yet certain developments occurred towards the 1960's that made Arthurian literature popular again, such as the publication of J.R.R. Tolkien's "The Lord of the Rings". Written by a respected academic, the novel featured many Arthurian characteristics, such as the Merlin-like character of Gandalf the wizard. Suddenly Arthurian legends became acceptable, and they were subject to extreme transformations at the hands of modern writers, encouraged by the Hollywood ideal of King Arthur. Among the great works of modern Arthuriana is T.H. White's "The Once and Future King". More recent and popular works include "The Crystal Cave" by Mary Stewart and "The Mists of Avalon" by Marion Zimmer Bradley.