John Piper recently interviewed Time Keller on the brilliance of C.S. Lewis.
Keller identifies C.S. Lewis as the "king of illustration" as opposed to Jonathan Edwards, whom he labels the "king of imagery." Lewis has the ability to craft a "sparkling" illustration of Christian truth. Keller explains how Lewis takes the abstract truth and clarify with the concrete illustration.
On the importance of building illustrations, Keller shares a humorous anecdote when Flannery O'Conner was asked if she could put her story into a nutshell using one sentence. Her response was, "if I could put it in one sentence, I would not have to write the story!"
Tim Keller recommends starting with the following C.S. Lewis works: