This paper speaks about ambience in architecture in the flow and results of experimental design studio Achten/Novakova in Summer semester 2016 that cooperated with PET-MAT, a research team focusing on recycled plastic in architecture. This time, also questions of management of a big student group arose. Fifteen teams (50 participants) of the studio designed, presented and delivered ambient installations to the public event called Student Night. It was a small temporary architecture: bars, stage decoration, corridor decorations and furniture like tables or chairs all made of plastic. Particularly, results of research on recycled PET in architecture were implemented here in form of a new plastic brick called PET(b)rick. The Installations were directly tested by visitors of that event and have proven the concept of PET(b)rick.