  If we assume that Invert is otherwise like a normal human perceiver, then a major asymmetry in color space shows that Locke was incorrect. Hue (red, green, bluish-red, etc.) is not the only perceptually salient dimension along which colors can vary: there are (usually taken to be) two other dimensions, saturation and  lightness.[14]  A color is saturated to the extent to which its hue is intense or vivid: pastels are desaturated, and achromatic colors (blacks, whites, and grays) have no saturation. Colors become lighter as they become less grayish or blackened. Arranging the colors along these three dimensions produces a color solid, an example of which is shown in figure 5: