The variable structure consists of three parts: a central core, a shell and a framework connecting the core to the shell. The core is a polyhedron, while the shell is the truncated version of the same polyhedron. The frame consists of struts radially extended from the vertices of the core that are branched to meet the vertices of the shell. In this way, rigid structures are formed, which can be considered for various facilities, such as space stations, buildings and other enclosures.