This book is really divided into 3 parts: history of expression of space through paintings, history of physics, and Wertheim's views on cyberspace. The first two sections are top notch research articles, comprehensive, easy to follow, and very accurate. These two sections alone could have be made into a book. The last section, however, is quite subjective. It basically states that cyberspace will replace the Christian heaven, becoming New Jerusalem, where all will be good, and none shall die. It is where our bodily restraints shall be no more, and we can live with a new image, created through our likings. This is all well in theory, but there are too many problems with utopians created by man. There is also mention of downloading our souls into cyberspace, where we can live after our bodies die. Quite far fetched, and it presents problems as well. Nothing is wrong with new ideas being presented, but wishes for the impossible will never be granted. Living human beings belong to the physical world, and without a body one cannot really be called human...