John H. Hubbard, The American Mathematical Monthly
"It has been a great pleasure to read such a gracefully written, original book of mathematics ... it is a flowing narrative, leavened with wit, whimsy, and lively cartoons by Larry Gonick. The three authors, with the support of Cambridge University Press, have produced a book that is as handsome in physical appearance as its content is stimulating and accessible. The book is an exemplar of its genre and a singular contribution to the contemporary mathematics literature."
Albert Marden, Notices (journal of the American Mathematical Society)
"The production of the book leaves nothing to be desired. It is splendid. Printed entirely on glossy paper, with practically all of the many figures in glorious color, the book has a number of admirable design features: large type and wide margins wherein references are given and occasional comments (often quite talky) are made. Cambridge University Press has done a beautiful job, and David Tranah of the Press deserves special commendation for his role in pulling out all the stops."
Philip J. Davis, SIAM News
"All of it is patiently explained ... By the time you finish, you'll know your way around the complex plane."
Brian Hayes, American Scientist
"The book itself is a work of art ... I am sure that [it] will have a major impact on the way we teach geometry and dynamics ... a jewel that will more than repay the persistent reader's efforts."
Michael Field, Science
"I rarely feel a certain kind of euphoria by just looking at the cover of a mathematics book. But that happened with Indra's Pearls: The Vision of Felix Klein ... [contains] fantastic illustrations together with apparently well-founded mathematical explanations ... [it is] presented in an accessible way which dares to prioritize general comprehension above a strict theoretical approach ... As far as I know, this book is one of the most beautiful examples of the illustration of the inherent aesthetic beauty (which exists) within mathematics ... the images are of the highest quality obtainable at present for mathematical structures. Everyone, who ever tried to create something comparable, knows how difficult it is."
Jürgen Richter-Gebert, Technische Universität München
"This unique book can serve as a pedagogical and visual introduction to group theory for schoolchildren, and yet is just as suitable for professional mathematicians: I believe that both of them would read the book from the beginning to the end. Finally, it can be used as a book for popularising science, but is very different from most fashionable books on strings, black holes, etc: it gives you the joy of seeing, thinking and understanding."
European Mathematical Society
"This is a beautifully presented book, rich in mathematical gems."
The Mathematical Gazette
"One can browse through the numerous beautiful and fascinating pictures and marvel at them ... Readers with widely different backgrounds will find something enjoyable in this unique book."
Acta Scientiarum Mathematicarum