Send air through your larynx without stopping it. Let it pass freely. Let it through, some things you just have to let go. That’s a vowel. Stop the air with your throat or mouth, it’s a consonant.
Don’t stop, this is about U. U and U alone. Place your tongue in the middle of your mouth, center it. Now pull in your lips on all sides. Pursed. Hold up now, Just a teeny purse, don’t let your lips stick out too far: you want to say the letter U, not detach yourself from reality. There you go, now let the air out. Excessively pursed lips tell facial recognition experts (trust me, there is such an expert) that you are saying something opposite to reality, the one in your head: you are speaking in opposition to your thinking. Maybe you don’t understand what you are saying, but you are saying it anyway. Maybe you are lying. When you hold the truth back with your teeth like that, your lips have to do all the heavy lifting. Don’t you lie to me, I can lip read.
Carve three lines like a table, left side taller. A purse dumped out. An aurochs in profile.