a great question! hard one to answer too huh! I would say its a bit of both. There is a fundamental mathematical beauty in all life that is based on golden mean proportions. We find things that are in harmony with the shapes and natural proportions to be beautiful..
But then there is a lot of subjective beauty within that which is our own preferences and likes / dislikes. That we over lay on top of the math.. I think when something doesn't follow the math first, very few will find that beautiful.
Therefore. if i had to choose one, i would say that the Math and proportions of our bodies primarily define our beauty and if we are deemed beautiful! ;=)
Its such a good question i might ask it to the ecoTrain. We're posting collaborative question and answers on a theme of the week... Would it be ok if we asked this same question and see what the 14 of us come up with?
You can check out this weeks post and question on the theme, what is freedom, are you free?
thanks!