Mathematics takes place in the mind. Visualization exercises spark fun and interest in mathematics. During visualization exercises, all students are present in class and think intensely. Not only the strong students, but also those who struggle academically find a discovering and personal approach to mathematics through these exercises. As a teacher, you gain valuable insights into the thinking and problem-solving processes of your students. In the first, didactic part of this book, you will learn how to implement visualization exercises in the classroom and how to effectively utilize the individual concepts of your students for learning processes. The practical section of the book contains an extensive collection of tested visualization exercises from various areas of school mathematics. Suitable for mathematics teachers in secondary education I and II.