I was trying to explain to a student the distinction between the /th/ phoneme and the /s/ phoneme – many Koreans have trouble with the distinction, since the /th/ doesn't exist in the language, and the problem isn't helped by some sector of the English education complex teaching them that there is really not any difference in the pronunciation between e.g. "mouse" and "mouth".
So I drew a picture, because he was quite young. It was a spur-of-the-moment illustration, but I was pleased with it.
[daily log: walking, 5 km]