The color of paint is closely related to light. Different colors can reflect or absorb varying amounts of light, affecting the brightness and ambiance of a room. Light-colored paint can enhance the sense of light in a space, while dark-colored paint can create a warm and cozy environment. 

Paint greatly influences visual perception. Different colors and textures can alter the feel and perceived size of a space. Bright colors make a room appear larger, while dark colors create a sense of intimacy. Matte or glossy finishes can also change the visual effect of the walls.