We interpret the world around us through color, and yet color does not exist if we do not see it and process it in our brains. It is not a simple concept, however. Arielle and Joann Eckstut delve here into 50 questions about color across a variety of fields—physics, chemistry, biology, technology, and psychology—to explore how and why we see color; how color relates to light; what the real primary colors are; and how biology, language, and culture affect our understanding of color.