  The lightness dimension corresponds to the central vertical axis, with white at the top. The hue and saturation dimensions correspond, respectively, to the angle around the vertical axis, and to the distance from it. Thus the shades of maximum saturation are on the outside of the solid. Notice that the yellows have their maximum saturation at higher levels of lightness than the reds and the blues. So, assuming that Invert’s judgments of the relations between colors are—modulo the inversion—normal, a possible Lockean 180° hue rotation scenario would be behaviorally detectable. Invert would judge the maximally saturated colors she calls ‘shades of blue’ to be lighter than the maximally saturated colors she calls ‘shades of yellow’. Further, there are more distinguishable hue steps between blue and red than there are between yellow and  green—a fact that is reflected in the Munsell space, whose hue circle has five hues equally spaced: red, yellow, green, blue, purple. (Contrast the NCS space mentioned in the previous subsection.) Hence the Lockean inversion function \(I\), assuming it is defined on all hues, would map some distinct hues (in particular, some bluish reds) to the same hue (in particular, the same yellowish green). The range of \(I\) would therefore contain fewer hues than its domain. Invert would not be able to distinguish some stimuli (those she calls ‘bluish red’) that Nonvert could tell apart, and so again the inversion would be behaviorally detectable.