Corey Anton has argued that we cannot be certain what is separate from or unified with something else: language, he asserts, divides what is not, in fact, separate.
kˈɔːɹi ˈæntɑːn hɐz ˈɑːɹɡjuːd ðæt wiː kænˈɑːt biː sˈɜːʔn̩ wʌt ɪz sˈɛpɹət fɹʌm ɔːɹ jˈuːnɪfˌaɪd wɪð sˈʌmθɪŋ ˈɛls: lˈæŋɡwɪdʒ, hiː ɐsˈɜːts, dᵻvˈaɪdz wʌt ɪz nˈɑːt, ɪn fˈækt, sˈɛpɹət.