Private Sezin School Open Roof Space is a ‘beyond-classroom’ pedagogical space with a spatially hybrid program that fosters meeting, making, learning and working. The key question in this project was how ATOLYE could transform a progressive K12 school towards a pedagogical laboratory for 21st century skills. To this end, borrowing from Fuller’s trimtab concept, the project intervened in a lightweight yet effective manner and chose the formerly dormant empty rooftop space of the existing building, measured at approximately 1,700 m2 within 15,000 m2.