GSU · Readification · Interactive Lab

The Mouth That Makes the Sound

Every letter is a picture of a sound your mouth already knows how to make. Watch how the lips, tongue, teeth, and voice build each one — then test your eye. Free, no login, on any device.

GENO AI Tutor available 24/7 — a robot you can actually TALK to. Stuck on a sound? Ask GENO to explain how to make it, out loud, in any of 32 languages. He has memorized this whole lab and every book behind it.

Teach-then-play, infinite practice, free forever from Global Sovereign University, a 501(c)(3). “Every person on Earth is born with an American spirit: an untamed yearning for a better tomorrow.” — Dr. Gene A. Constant

This lab animates with JavaScript. Each English sound is formed by a position of the lips, tongue, teeth, and voice — for example, /m/ closes the lips and sends the voice through the nose, while /s/ lifts the tongue near the ridge behind the top teeth to make a hiss. Ask GENO to walk you through any sound aloud.