The choice of color and contrast in building design has a decisive impact on human orientation and our well-being. The psychological effect of light and color should therefore be deliberately utilized in the design of spaces and buildings. Apart from aesthetic and psychological considerations, the significance of light and color as an important planning basis for constructions is also reflected in the standard DIN 18040 "Barrier-free Construction." In this book, the author presents essential background knowledge and practical examples for the professional implementation of color concepts in building design, tailored to specific user groups, building types, and various age groups.