Additive colour mixing involves adding colours of light together, like using multiple lights with different colour gels, or RGB LEDs. Subtractive colour mixing involves combining two secondary colours, like mixing two colour gels in a light or CMY colours in moving lights. Colour can be used to enhance moods by using red for anger, help depict atmospheres by using colours for times of day and locations like sunrises, or create stylized unreal lighting like in Warhorse. The document gives examples of atmospheric lighting in The Lion King sunrise and Billy's angry dance.