"This is an exciting epistemological experiment. It is wonderful to see how intelligent philosophers can take a modest concept, such as that of the hole, as a starting point for an immense and brilliant exercise.... The writing is delightful."
—Valentino Braitenberg, Director, Max-Planck-Institut für Biologische Kybernetick

"The idea of Holes and Other Superficialities is wonderfully counterintuitive: The authors want us to think of absences as full-fledged cognitive entities. The book describes a grand variety of holes—holes in doughnuts, tunnels through blocks, flowing gaps in regularly-spaced flowerbed, and hundreds more. There are an enormous number of beautifully-rendered illustrations of every imaginable (and often never-before-imagined) type of hole....The overlap with philosophical issues of every sort is marvelous, and the authors have a delightful sense of humor."
—Douglas Hofstadter, author of Gödel, Escher, Bach