Humans are capable of producing a rich variety of sounds, especially the vowels (a, o, e, i, u) that form the core of syllables. The secret lies in precise physiological coordination. When a steady airflow from the lungs passes through the larynx, it causes the vocal cords to vibrate periodically, producing the basic voice. The specific vowel ultimately formed depends on the resonating cavities above the vocal cords—primarily the morphological changes in the oral cavity. By adjusting the height and position of the tongue, the rounding and spreading of the lips, and the opening and closing of the jaw, we are essentially creating a constantly changing "sound filter." The same vocal cord vibration source, after passing through resonating cavities of different shapes, is filtered and amplified to produce different resonant frequencies, thus forming distinctly different vowels. Understanding this is fundamental to understanding the mechanism of human speech production. Our interactive exhi
