Human beings carry within them nostalgia of a primordial happiness from ancient times. The notion of a return to these origins of happiness is often associated with Nature. Our intention is to encourage inhabitants to participate in fun, uncommon events taking place within the urban landscape: an inflatable bridge equipped with giant trampolines rises above the Seine, a pavilion erected in a London park, a museum traversed by a roller coaster. These projects offer, in the heart of the city, new forms of Elysian Fields, given over not to the Champs-Élysées of shopping and strictly urban activities, but rather to fundamental human practices, which liberate strong emotions calling on all our senses. [...]