I have many Escher books in my library, but this is the book I go back to again and again. I cannot praise enough the way this book is set out. Not only are the finished tesselations pictured, but the preliminary sketches that Escher used are also shown. This gives an insight into how his work developed from landscapes, through the impossible worlds to the tesselations. There are numerous fold out pages and the inside of the dust jacket has the complete "Metamorphosis2" depicted on it's inner side. I lent my copy to my wife who teaches mathematics, and the whole of her department raved about the book, I'm still waiting for it to come back!!!! Bob Dunkley