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Well I dont know what you mean by 'rational element' . . . but the gothic arch was an evolution of the Roman Arch and could carry greater loads, hence wider and higher spans . . . the fying buttress then developed to take out the lateral forces. old technology now though . . . . . . . no-one builds gothic arches any more, that was a hundred years ago and more . . . . nowadays its all steel and reinforced concrete . . . . . although its true that the Romans had reinforced concrete . . . . . . I think I know what your professor had in mind when he framed the question but like all professors they could do with spending 5 minutes in the real world! (no offence).
PS : String Quartets went out around the same time as the gothic arch! Replace string quartet with Eminem MP3 if you want to be current . . . just how old was this professor!?!
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Where your talents and the needs of the world cross . . there lies your vocation.
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