Simultaneous contrast is a visual phenomenon where the perception of a color is affected by the colors surrounding it. When two colors are placed next to each other, the contrast can make one color appear lighter or darker than it actually is. This effect occurs because our eyes and brain interpret colors in relation to their neighbors, enhancing the differences between them. This concept is often explored in the field of color theory and is important in various applications, including art, design, and advertising. Artists and designers use simultaneous contrast to create visual interest and to influence how viewers perceive colors in their work.