This is a case study based on a proposal made by architect Josef Plecnik for the city of Ljubljana in 1944. The city builds a roof and provides the infrastructure for a neighborhood. Residents build houses beneath the common roof. A similar concept may be seen in present-day Johannesburg (although on a different scale). Here, a roof and essential infrastructure are provided to individual families, but not to the whole community.

Marjetica Potrč (b. 1953) is an artist and architect based in Ljubljana, Slovenia. Potrč's interdisciplinary practice includes on-site projects, research, architectural case studies, and series of drawings. Her work documents and interprets contemporary architectural practices (in particular, with regard to energy infrastructure and water use) and the ways people live together.