The Doric order dominated during the 6th and the 5th century BC but there was a mathematical problem regarding the position of the triglyphs, which couldn't be solved without changing the original forms.
ðə dˈoːɹɪk ˈɔːɹdɚ dˈɑːmᵻnˌeɪɾᵻd dˈʊɹɹɪŋ ðə sˈɪksθ ænd ðə fˈɪfθ sˈɛntʃɚɹi bˌiːsˈiː bˌʌt ðɛɹwˌʌz ɐ mˌæθɪmˈæɾɪkəl pɹˈɑːbləm ɹᵻɡˈɑːɹdɪŋ ðə pəzˈɪʃən ʌvðə tɹˈɪɡlɪfz, wˌɪtʃ kˌʊdənt biː sˈɑːlvd wɪðˌaʊt tʃˈeɪndʒɪŋ ðɪ ɚɹˈɪdʒɪnəl fˈɔːɹmz.