Linguist Dr. Christine Ericsdotter has on her website three animations (.gif) made by compiling x-ray photographs of peoples’ mouths as they speak.

Each subject is recorded for 20 seconds at 50 images per second. The x-ray films are of high quality, which facilitates the phonetic interpretation.

One, two and three.

Much more visually exciting than those diagrams you get in linguistics textbooks!

(via hundertmark)