A series of word/mind games that are fun to decipher. Back cover: '"In his earlier work, Laing guided the reader to understanding. In 'Knots', he compels him to experience... To grasp this dense and difficult book, one must be willing to follow Laing in his spirals of descent. If 'Knots' is to yield, one must yield to the knots."' - James S. Gordon, 'The New York Times Book Review'.
It's not difficult as in physics or "Paradise Lost". It's more like Raymond Smullyan.