There is often more to reality than what we see on the surface, and these hidden layers can lead to unexpected beauty. The 32 line drawings in this book may be viewed in any of several ways. They can be regarded simply as works of art, black and white drawings, just as they are. Some of the more intricate illustrations can operate as puzzles, for you to find and illuminate the underlying structure. In this respect, you're encouraged to look past the superficial details and wonder: Is that a picture on the wall, or a window looking through the wall? Which is the foreground, and which the...