I want to learn the theory of how a certain pitch is produced of a singing glass bowl.
I.E. is it possible to calculate the pitch of a glass bowl by its dimension thickness or any other attribute?

I have a patterned clear glass bowl I use. Placed on a piece of fabric, I find it as useful as a crystal ball or a scrying mirror. I fill it with water and use a candle for subtle light. Then just gently let the images flow.
Afrowoman–I’ve never heard of the egg… tea leaves… but not the egg.

Hello, Toad

Is it just me? every time I see that commercial I think some kid out there will mistake it for candy and be tempted to eat it. the way it comes in the resealable packet the round shape of the scents and the bright colors. Not to mention the decorative glass bowl to put the scents in. I have two 1 year old nephews that are walking around and one of them gets into everything! It just always made me think lawsuit waiting to happen. Whats your opinion on this?

If I put tap water ,salt ,and a SiO2 crystal into a plastic/glass bowl in a shady/dark place?
Do I also need a source of energy?If so what would you suggest and for what purpose?