This book explains, in simple steps and non-mathematical terminology, how to create repeat patterns in a line, on the plane, as tiles, and as Escher-like repeats. The book also shows how to make‘wallpaper repeats', where the elements of the pattern merge into each other, apparently seamlessly. Using letters as the basic elements, the book demonstrates how all repeat pattern-making comes out of four simple operations: translation, rotation, reflection, and glide reflection.