>> Blue has highest frequency and shortest wavelenght, whereas red has >> lowest frequency and longest wavelenght, thus the natural assotiation >> of wovels with colors is: >> >> i Blue ü Magenta u Red >> ï Azure ů Orange >> e Cyan ö White o Yellow >> ä Tyrquise å Lime >> a Green > >How do you work this out? Frequency and wavelength are independent, and >you're linking them with first and second formants? I don't follow... i-ï-e-ä-a-å-o-ů-u are sorted simply by the formant f2 and associated with the spectral colors B--C--G--Y--R from the highest (*there* called "shallowest") to the lowest (deepest) frequencies. /ü/ is between /i/ and /u/ like M between B and R; /ö/ is in the centre of the triangle like White. If there is both front rounded /ü/ and back unrounded /y/ and so we want the cube instead of the triangle, then /y/ may be associated with blacK. The R component then corresponds to roundness, the G component to openness and the B component to frontness.