The lasers of a plasma ball don't actually follow your finger. What you're seeing is an illusion created by the interaction of the plasma with your finger and the way our eyes perceive light. Here's a breakdown:

* Plasma: Plasma balls contain a low-pressure gas that is ionized by high-frequency radio waves. This creates a cloud of charged particles, which glow brightly due to the energy they release.

* Electric Field: The radio waves create an electric field within the plasma ball. This field is constantly changing, causing the charged particles to move and dance around.

* Finger's Influence: When you bring your finger close to the plasma ball, the electric field is disrupted. The charged particles are drawn towards your finger, creating a visually striking "stream" of light.

* Optical Illusion: Our eyes perceive the bright light following our finger as a "laser," but it's not a laser beam. The light is scattered and diffused, and the effect is more like an intense, concentrated glow attracted to your finger.

In summary: The plasma ball doesn't have lasers. It's the movement of charged particles within the electric field, influenced by your finger, that creates the illusion of light following your finger.