Vowel Height and Nasalization
Nasalization may cause a vowel's articulation to shift. However, while nasalization due to the assimilation of a nasal consonant will tend to cause a raising of the vowel's height, phonemically distinctive nasalization tends to lower the vowel. In most languages, vowels of all heights are nasalized indiscriminately, but preference occurs in select few languages, such as to high vowels in Chamorro and low vowels in Thai.
Read more about this topic: Nasal Vowel
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—Samuel Taylor Coleridge (1772–1834)
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—Wallace Stevens (1879–1955)