This book was the follow up to the extraordinary success of "An Experiment With Time", and is a continuation of the analysis of the theories that he advanced on the first book, and on "Serialism"
According to Dunne:
"In this book I have tried to give the reader a bird’s-eye view of the territory covered by the theory called ‘Serialism’. Some of the chapters, greatly condensed, have been delivered in lecture form to the Royal College of Science (Mathematical Society and Physical Society). But the main outline of the subject is, I believe, clear enough to be appreciated by those who have no special technical knowledge. "