The sheer volume of free art film screenings in the city is enough to make even the most consummate buff's eyes glaze over, but this Thursday at DeLeon White Gallery, those same eyes might just pop out of their sockets. RATTLE A CAGE! part of "Salon Thursdays" at DWG, will present art films by artists—selections from those whose primary medium is not necessarily film. R. Bruce Elder, Angela Joose, renowned performance artist Istvan Kantor, and......