Newton’s Disc, named after the renowned physicist Sir Isaac Newton, is a simple yet profound demonstration of how white light is composed of various colors. It is a circular disc divided into segments of the seven primary colors of the visible spectrum: red, orange, yellow, green, blue, indigo, and violet (often abbreviated as ROYGBIV). When spun rapidly, the colors blend together, creating the perception of white or nearly white light, illustrating the phenomenon of color mixing.