Sometimes, artists need specialized tools to bring their ideas and intentions to life. The 5th grader in the above picture is glazing a bowl (that he made on the potter's wheel) in a very specific way: he was intent on applying black glaze so it would drip down the inside edge in thin lines, and STOP when the lines reached the floor of the pot.
"H" made several false starts with brush and drip methods and determined that he needed a straw to blow the glaze in the direction he wanted, for the duration that was needed. Voila! A new glaze tool and glazing technique is born!
This video shows the "eye" pot being thrown on the potter's wheel.