 The sophist first “separates hard and white,” establishing that the shape “horse” is not the same thing as the color “white.” The color alone does not specify the location that is white; saying “white horse” does. Therefore horse, the shape, is not white, the color. Indeed, horse specifies no color at all. White horse, on the other hand, does specify a color. So again the sophist has shown that white horse and horse have distinct features. Thus white horse is not (identical to) horse. 