The purpose of this study is to explain the process of designing the architecture of StrangeSpaces, an itinerant festival for transcultural performing arts groups or artists which starts from the original idea and terminates with the description of a possible structure. The process of designing StrangeSpaces is based on an investigation on the transcultural performing art’s field and on conversations with experts, which together transformed the original general idea of a festival, into the specific architecture of the StrangeSpaces festival. The investigation resulted in a personal definition of ”transcultural performing arts”, that subsequently led to the identifications of three elements of transculturalism which define the festival’s goals as ”encounter with the other” in multiples and different yet equal levels. Another result of this investigation is the contextualization of StrangeSpaces in the contemporary international cultural politics. In fact, the transcultural encounter and exchange can be viewed as a possible response to the increasing need of sustainable international performing art in local, national and European cultural communities. The conversations with experts in the field of international performing arts complemented the investigation, contributing to the ideological principles of StrangeSpaces, such as anti-racism and anti-colonialism, as well as to a model of democratic and sustainable design, in which multilingualism and cosmopolitan aspects of the society are essential cues. The result of the study is a design of the architecture of three versions of StrangeSpaces, an itinerant transcultural performing arts festival that is born to be a space, a free place where people play, exchange roles, art, experience starting from their own culture, but reaching and reflecting into the other, mirroring a society of sustainable diversity.