Plato argued that all things have a universal form, which could be either a property or a relation to other things.
plˈɑːɾoʊ ˈɑːɹɡjuːd ðæt ˈɔːl θˈɪŋz hæv ɐ jˌuːnɪvˈɜːsəl fˈɔːɹm, wˌɪtʃ kʊd biː ˈiːðɚɹ ɐ pɹˈɑːpɚɾi ɔːɹ ɐ ɹᵻlˈeɪʃən tʊ ˈʌðɚ θˈɪŋz.