nˈætʃɚɹəl mˈoʊʃən dᵻpˈɛndz ɔnðɪ ˈɛlɪmənt kənsˈɜːnd: ðɪ ˈiːθə nˈætʃɚɹəli mˈuːvz ɪn ɐ sˈɜːkəl ɚɹˈaʊnd ðə hˈɛvənz, wˌaɪl ðə fˈoːɹ ɛmpˈɛdəklˌiən ˈɛlɪmənts mˈuːv vˈɜːɾɪkli ˌʌp lˈaɪk fˈaɪɚ, ˌæzˌɪz əbzˈɜːvd ɔːɹ dˌaʊn lˈaɪk ˈɜːθ təwˈɔːɹdz ðɛɹ nˈætʃɚɹəl ɹˈɛstɪŋ plˈeɪsᵻz.
Natural motion depends on the element concerned: the aether naturally moves in a circle around the heavens, while the 4 Empedoclean elements move vertically up (like fire, as is observed) or down (like earth) towards their natural resting places.