Two BASE jumpers soars above Shanghai skyline after leaping from China's tallest building Jinmao Tower in Shanghai October 5, 2004. Thirty-eight base jumpers from 16 countries, including six Chinese jumpers, showed their skills and aerial techniques as part of China's week-long National Day holiday and tourism golden week. BASE is an acronym for building, antennae, span (or bridge), and Earth representing the fixed-objects from which BASE jumps are made.