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Sixty years ago, shortly after the beginning of the Pacific War, a classical work of phonetics was published in Tokyo, The Vowel: Its Nature and Structure by Tsutomu Chiba and Masato Kajiyama [1]. This monograph can be regarded as a classical work for two main reasons. For one, it opened the way to calculate a vowel spectrum from the data of the three-dimensional vocal tract shape for the first time in the history of phonetics. For another, it gave strong impetus to the foundation of what we today call the acoustic theory of speech production [2,3].

From articulatory phonetics to the physics of speech: Contribution of Chiba and Kajiyama.