These include Sun Yuan and Peng Yu's video “Dogs That Cannot Touch Each Other” (2003) where eight pit bulls leashed to treadmills strain towards each other; Xu Bing's documentation of performance "A Case Study of Transference" (1994) where two live breeding pigs stamped in ink with words with Latin and Chinese characters copulate in front of a gallery audience; and Huang Yong Ping's installation "Theater of the World" (1993) where thousands of insects and reptiles, including gekkos, locusts, crickets, centipedes and cockroaches, walk on top of each other a tabletop with a see-through dome.