3+ SYSTEM AT BARBARA, WROCŁAW BARBARA: new design space zieta.pl/barbara All arrangements are based on 3+ collection - new. modular furniture system designed by Oskar Zieta. 3+ is innovative technology for stabilising sheet-metal, in the form of our furniture collection 3+. It’s a modular solution reflecting today’s nomadic and mobile lifestyle. Thanks to set of connectors every stabilizing perforation can be used as starting point for creating a new construction.