A Plasma Ball is simply a glass ball or sphere with an inside pressure below 0.01 atmospheres. The ball contains an electrode connected to a 35 khz 2-5 kv high frequency transformer. The electricity produced by the transformer travels to the electrode. Because of the low pressure of the sphere the electricity breaks away from the electrode and travel along the magnetic field created by the electrode. The glass is an insulator so it stops the current and keeps the electricity which is now called plasma inside the sphere. When you approach a plasma ball the electromagnetic field of your body disrupts the magnetic field produced by the electrode causing the plasma to concentrate on the point of contact. The first plasma balls where created by Nicola Tesla while experimenting with high voltage phenomena. The modern version was created by Bill Parker.