Penrose is back, and ready to usher young readers along as he encounters more amazing mathematical ideas in a sequence of adventure tales. At once demystifying and challenging, the book gives readers visuals to consider and things to do as they -- along with Penrose -- discover mathematical "rep-tiles"; meet x, the mathematical actor; find out when one and one do not equal two; help Sorry Snowflake find its symmetry; cross pi's path; learn that mathematical...