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The ionic sphere is designed with a high-strength glass casing. The ball is filled with a thin inert gas and a black spherical electrode is positioned in the center of the glass sphere.
After being energized, the arc is generated by the arc formed by the electrode plus the inert gas of high pressure excitation, so the light that occurs is like a radial glow, colorful, radiant and very beautiful in the darkness.
When working, a field similar to the point charge forms around the electrode in the center of the ball. When the ball is touched by hand (the person is connected to the ground), the electric field and the distribution of the potential around the ball are no longer uniform and symmetrical, so the glow becomes brighter around the finger. The resulting arc moves in a twist along the touch of the hand and dances with the finger.