Hold tight...
![](https://pbs.twimg.com/media/DdSDM8oVMAEur3c.jpg)
![](https://pbs.twimg.com/media/DdSENbsV4AEj1Fr.jpg)
Here is a complicated anatomical drawing of a human vocal tract, and a diagram of the speak-pipe
![](https://pbs.twimg.com/media/DdSHUzPU8AAM4mK.jpg)
F1 - length of the upright part
F2 - length of the horizontal part
F3 - shape of the opening
(note that the pronunciation of words sounds different when said with duck-face lips)
![](https://pbs.twimg.com/media/DdSICApV0AE0Ylz.jpg)
![](https://pbs.twimg.com/media/DdSIa7FU8AA7lUV.jpg)
![](https://pbs.twimg.com/media/DdSLVeIVQAE5MXe.jpg)
![](https://pbs.twimg.com/media/DdSMGE7UQAIBjl5.jpg)
![](https://pbs.twimg.com/media/DdSXbo9VAAEXsPi.jpg)
![](https://pbs.twimg.com/media/DdSaxiTUQAMs_mA.jpg)
![](https://pbs.twimg.com/media/DdSe2-mVMAA-WnL.jpg)
![](https://pbs.twimg.com/media/DdSiryRUwAAWdfX.jpg)
![](https://pbs.twimg.com/media/DdT_7ctUQAAx5jR.jpg)
#badrobot
![](https://pbs.twimg.com/media/DdU61F9V4AEa3F1.jpg)
Thanks for that! 💯
![](https://pbs.twimg.com/media/DdXKTQdVQAAXvgL.jpg)