Inscribed over the entrance of Plato's Academy were the words, "Let no one ignorant of geometry enter my doors." To ancient scholars, geometry was the gateway to knowledge. Its core skills of logic and reasoning are essential to success in school, work, and many other aspects of life. Yet sometimes students, even if they have done well in other math courses, can find geometry a challenge. Now, in the 36 innovative lectures of Geometry: An Interactive Journey to Mastery, Professor James Tanton of The Mathematical Association of America shows students a different and more creative approach to geometry than that usually taught in high schools. Like building a house brick by brick, students learn to use logical reasoning to uncover fundamental principles of geometry, and then use them in fascinating applications.