An Experiment in Criticism is a 1961 book by C. S. Lewis in which he proposes that the quality of books should be measured not by how they are written, but by how often they are re-read. To do this, the author describes two kinds of readers. The "unliterary" reader tends not to reread the same book, while the "literary" reader does. He suggests the categorization of books as either "highbrow" or "lowbrow" is deficient in that it fails to appreciate those qualities which have merited re-reading. Source: Wikipedia (en)