this concept of food activism has extended to public events held under the aegis of other organizations. for example, for its contribution to the "altitude 1000" sonic and visual arts festival, held in brussels in december 2006, foam chose to invite kate rich and kayle brandon, who wildcrafted their own cola from an online, open source recipe. the participants of the resulting "cube-cola lab" took part in amy balkin's "radical cola challenge" by blind-tasting cube-cola alongside its major market rivals (including mecca cola and coca-cola). moreover, cube cola was then used as a so-called "watchlist ingredient" of the guantanamo libre cocktail.