The origami introduced in this book is designed based on geometry. The most important feature of 3D Origami Art is its form. The origami has curved folds and surfaces, unlike most known origami that is folded flat. The curved nature of 3D origami leads to many new and beautiful forms.This book explains how the shapes are designed with many easy-to-understand figures. The theory is mainly explained with figures. There are no equations so that general reader can understand and design their own origami with ease.