Higher ed critics say colleges lack viewpoint diversity. But there’s a problem with how we are—or are not—defining viewpoint diversity that could lead to less, not more, plurality on campuses. Much like God, money or Taylor Swift, viewpoint diversity has become a mirror concept onto which the observer projects her own values, fears and aspiration. For Heterodox Academy, an academic life–enriching viewpoint diversity is based on differences in things like socioeconomic status, political and philosophical views, religion or cultural background. The Trump administration’s idea of viewpoint diversity is less clear, however, despite the administration demanding more of it from Harvard and higher education as a whole.