reflections of the light source; glares, created by illuminated reflective surfaces; color reflections, generated by adjacent colored objects; and image Light in painting serves both technical and aesthetic purposes. Technically, it is essential to visual representation, as it conditions the perception of color, texture, and volume. Aesthetically, its interplay with shadow and its effects on color and illumination shape the composition and the image the artist intends to convey. Light may also acquire symbolic meaning, especially in religious cont Light is the physical agent that makes objects visible to the human eye. Its origin can be in celestial bodies such as the Sun, the Moon, or the stars, natural phenomena such as lightning, or in materials in combustion, ignition, or incandescence. Throughout history, human beings have devised different procedures to obtain light in spaces lacking it, such as torches, candles, candlesticks, lamps or, more recently, electric lighting. Light enables vision and is itself perceptible as a visual phenomenon. It makes color visible: light rays reach the retina, which transmits signals to the brain via the optic nerve. Perception of light is partly psychological, so individuals may perceive the same object or luminosity differently.Objects have varying luminance (or reflectance), absorbing or reflecting light to different degrees. This affects perceived color, from white (maximum reflection) to black (maximum absorption), both considered gradations of brightness rather than chromatic colors. When white light strikes a colored surface, only photons of that color are reflected; if these illuminate another similarly colored surface, they reinforce its saturation—an effect called radiance. Sunlight contains a continuous spectrum of colors that can be separated into the rainbow hues. Atmospheric scattering affects their perception: shorter wavelengths (blue) scatter more easily, giving the sky its color, while denser atmospheric conditions at sunset favor the perception of longer wavelengths (red). Color corresponds to specific wavelengths of light. The chromatic circle represents primary colors (lemon yellow, magenta red, cyan blue), their secondary mixtures (orange red, bluish violet, green), and tertiary combinations. Complementary colors are opposite on the circle, while adjacent colors lie close together. Mixing adjacent colors produces shading; mixing complementary colors creates neutralization. Color is defined by hue (position on the circle), saturation (purity), and value (luminosity), which increases with white and decreases with black or complementary colors. Light…