[en] Measurements were made of the motion of the filamentary structures in a plasma ball using high-speed cameras and other optical detectors. These filaments traverse the ball radially at ∼10⁶ cm/s at the driving frequency of ∼26 kHz and drift upward through the ball at ∼1 cm/s. The number of filaments and their radial speed increase approximately linearly with the applied voltage above some threshold. A custom plasma ball was constructed to observe the effects of varying gas pressure, gas species, and electrode properties on the filament structures.