Local environment enthusiasts Leandro Mendoza (R) and Ildefonso Vista collect rocks before performing rock balancing at Daranak falls in Tanay, Rizal province, east of Manila Sept 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. Mendoza and Vista pioneered this art form in hope of creating greater awareness among people towards environmental conservation. Picture taken Sept 5, 2011. [Photo/Agencies]