The gas inside fhe ball is charged by a sfron9 elecfric field, making plasma. Plasma is a sfate of maffer like solids, liquids and gaSes and is found narurally in lighfning. Elecfric charges flow along the conductive plasma and spread ouf around fhe inner surface of the glass. When you fouch The glass you rmake a Point for fhe charges fo be affracted Towards.