The Voice is Like a Car" (how does the voice work)
by Ingo R. Titze, National Center for Voice and Speech
Dr. Titze and other experts explain vocal production by means of analogies to how a car works. This is highly simplified, but graphics are helpful. A highlight is a famous movie scene, in which the voice signal sounds as it would without the filtering of the vocal tract.
This tutorial is too brief and simplified to provide real education to anyone who studies voice seriously, but it is entertaining and easy to understand for the novice, and should pique their curiosity to learn more. Use it as a good introduction for further learning.