This is a very simple way to make an instrument using water.
We've all seen the instruments made of glasses with different amounts of water, but the other day I figured out how to combine the cups into one. We all know that the more water you have in the cup, the lower the note is.
Step 1: Materials
All you need is the following:
A glass jar*
*Has to fit inside of the glass
Step 2: What You Do
To work this put the water in the glass and put the jar (full of air) into the water. To play, just lightly tap the jar against the edges of the glass, while moving it up and down to create different notes. I imagine you can find a way to play the right notes, someone has to have done something like this before.
Step 3: How It Works
This works because when you put mass in the water, it is "adding" to the water and rising the level of the water.
Also experimenting with this I figured out how to make air float!
This is a simple illusion. All you have to do is wedge the jar on the bottom of the glass and it will usually stick there.