Color also is movement, and its capacity makes color concrete to our vision. At the same time, although we may call a color green or red or yellow, every color is different to each person. In fine shades of color people do not see alike, because the capacity is different in each of them. The tone is according to the capacity. In other words, it is not the tone or the color which differ in value; they become different when we sense them, when we feel them: in their relation to us they are different.