*This book provides a full, general purpose and application independent exposition of the moiré phenomenon. * Based on the Fourier theory it leads the reader through the various phenomena which occur in the superposition of repetitive layers, both in the image and in the spectral domains. * The first chapters of the book present the basic theory which covers the superposition of monochrome, periodic layers. In later chapters the theory is extended to the even more interesting cases of polychromatic moirés and moirés between non-periodic layers. * Throughout the whole text the book favours a pictorial, intuitive approach which is supported by mathematics, and the discussion is accompanied by a large number of figures and illustrative examples, some of which are visually attractive and even spectacular. * Contains 474 pages, including a detailed glossary and more than 130 figures. This book is intended for students, scientists, engineers and any readers who wish to widen their knowledge of the moiré effect; on the other hand it also offers a beautiful demonstration of the Fourier theory and its relationship with other fields of mathematics and science. The prerequisite mathematical background is limited to an elementary familiarity with the Fourier theory.