ðeɪ stˈɑːɹt æz klˈeɪ skˈʌlptʃɚz ˌɑːntʊ wˌɪtʃ tˈuː ɔːɹ mˈoːɹ pˈɑːɹt mˈoʊldz ɑːɹ mˌeɪd ɪn ˈɔːɹdɚ tə ɹᵻpɹədˈuːs ˈɔːl ðə diːtˈeɪlz.
They start as clay sculptures onto which two- (or more) part molds are made in order to reproduce all the details.