Environment enthusiast Leandro Mendoza performs rock balancing at a school in Tanay, Rizal province, east of Manila September 5, 2011. Rock balancing is a performance art which involves arranging natural stones usually found on location, in gravity-defying arrangements without the need of any additional tools. Local environment enthusiasts Mendoza and Ildefonso Vista pioneered this art form in hope of creating greater awareness among people towards environmental conservation.   [Photo/Agencies]