The twirl on the back drop was made by the BCC Twirl filter. It has a motion tracker which should animate the motion by following the movement of the arm but I used the "twirl center" parameter on the filter and manually generated key frames to follow the movement of the hand for a tidier motion. The motion tracker generated scads of key frames - far more than were needed. The BCC Glow Alpha Edges filter added a soft white glow to the masked arm that improved it’s compatibility with the back drop behind it.