Chicano/a performance art continued with the work of Los Angeles' comedy troupe Culture Clash, Guillermo Gómez-Peña, and Nao Bustamante, known internationally for her conceptual art pieces and as a participant in "". Chicano performance art became popular in the 1970s, blending humor and pathos for tragicomic effect. Groups such as Asco and the Royal Chicano Air Force illustrated this aspect of performance art through their work. Asco (Spanish for "naseau" or "disgust"), composed of Willie Herón, Gronk, Harry Gamboa Jr., and Patssi Valdez, created performance pieces such as the "Walking Mural", walking down Whittier Boulevard dressed as "a multifaceted mural, a Christmas tree, and the Virgin of Guadalupe. Asco continued its conceptual performance piece until 1987.