Color mixing
Color mixing means mixing two or more colors together. For example, mixing green and cyan makes the color spring green. It is not commonly taught to children, as it does not correspond to the mixing of physical substances which would correspond to subtractive mixing. Two beams of light that are superimposed mix their colors additively. The mixing of colored physical substances corresponds to an additive color and subtractive color mixing, hence it corresponds to our intuition about mixing colors.