Toy, Games and Hobby Products Design cir Construction set by Salman Ebrahimi Arc_shaped pieces which are connected with three types of connection and create numerous forms. this toy consists of several pieces and each piece is an arc_shaped plastic which forms a quarter of a circle. all arcs are in same size and with three types of connecting piece can be connected to each other. various forms are made by it. the expansion and adding pieces based on circular or spherical forms is its features, that a new forms are created by connecting them with each other which can be utilized by both children and older.