Vanessa Yaremchuk, who works in the field of artificial neural networks with special application to music, just pointed me at this.
The T-Stick is "a gestural musical controller designed and built by Joseph Malloch. The T-Stick can sense where and how much of it is touched, tapping, twisting, tilting, squeezing, and shaking."
And at Mapping The T-Stick, there is a sequence of videos showing the thing being played.
Vanessa says "I recommend playing all the videos at once, personally. The sound is
more fun that way." And it is kind of weird. She adds: "Joe is already in the middle of the next version of this thing, and this time it is made out of bamboo with sensors on the inside and it is looking very cool."