 Some might wonder whether there is a pitch analog of the trouble posed by the kind of variation associated with spectrum inversion in the case of color (see the entry on  inverted qualia).  Spectral shift in pitch, sometimes dramatic, commonly occurs after cochlear implant surgery. This is not spectral inversion for pitch; but, a dramatic shift makes most of the same trouble as inversion. Not quite all the trouble, since cochlear implants preserve the pitch ordering and its direction. But, there could be a cochlear implant that switched the placement of electrodes sensitive to 100 hertz and 1000 hertz, respectively; and there could be one that reversed the entire electrode ordering. This goes some distance to grounding the conceivability of a pitch inversion that reverses the height ordering of tones.