While others build mere worlds, Moorcock has built the multiverse. While many use his ideas, these days, he was the first to conceive the idea as it is used throughout fantasy fiction. Just as some of his books slowly unfold to show you ideas from different angles, so does he slowly reveal the multiverse. Read this and the three books in the War Amongst the Angels series and you will see what I mean. Moorcock was also the author who predicted Black Holes and a whole different cosmology to go with them, he spoke of the multiverse in terms of branches or branes on a tree, and science has continued to prove him right throughout his career. Moorcock is far more than a writer of fantastic adventure stories, but neither does he reject his own relish for the stuff and as a result he gives us books which, as adult, we can enjoy more and more. The literal minded consumer of mass production fantasy is probably going to need a lot more explanation than Moorcock provides. You just have to trust him, jump in anywhere, and let him carry you on a wild tide of adventure, character, philosophy and more! The ending of this sequence is famous. So it should be. There is nothing else as good, at least since Melmoth the Wanderer! (Actually, it's better than Melmoth the Wanderer).