The flip technique.

One of the ways that can be used to show toup wearage is to flip an image around horizontally. Why this is so effective is unclear exactly, but what it appears to do is to throw the sense of familiarity and re-focus the mind on the "un-naturalness" of the hair-style. The classis toup swoosh style that Shatner wore is in itself somewhat unnatural - real human hair doesn't really comb that way.