Hydraulophone

A hydraulophone is a musical instrument that makes sounds using water. It's like a big bathtub with lots of holes, and when you put your fingers in the holes and touch the water, it makes sounds.

Imagine you have a cup full of water and you blow into it with a straw. The bubbles and the water make a sound. That's sort of like what a hydraulophone does. Except instead of blowing, you touch the water with your fingers.

The way it works is that there are pipes that bring water into the instrument and then it flows out through holes called "resonators." When you touch the water in the resonators, it makes the water vibrate and that creates sound waves. And those sound waves are what you hear as music.

People like to play hydraulophones because they make really cool and unique sounds. Plus, it's fun to touch and play with water!