Book excerpt: This book is about exploring the tetrahedron by using only the nine creases generated by folding the tetrahedron into a paper circle. It has more mathematical and educational information than The Wholemovement of Geometry: folding the circle for information book. At the same time the tetrahedron folds takes the circle folding process to a deeper level, folding forms observed in the natural world, making stronger connections to art and mathematics, and demonstrating algebraic functions experientially appropriate for 5 and 6 years old students. A hands-on ethics is observed and discussed that only occurs with folding the circumference. Most of the folding and information in this book is new, and what is carried over is different in presentation. It stands on its own without any prerequisite. This makes it a good companion to The Wholemovement of Geometry.