Light defraction

Lately I've been thinking a lot about how visuals are almost always 2 dimensional. Most times it's a beamer on a wall or 3d-mapped on fixed objects. How could I make visuals that are really in the space, that really have a changing form? How could I make it 3 dimensional?

Here is the beginning stage and test model that came out of this thought. Also with cymatics in the back of my head, I made this instrument that creates light and sound. Where the light is reacting to the sound. (In this video it's still without the sound part.)

I put two hemispheres on top of each other with a light exactly in the middle. The idea would be to put a transducer on the bottom and moving the two hemispheres from each other to change the light and sound.