Abstract: A framework for a building or other hollow object utilizing a plurality of basic building elements which are interconnected together in which each of the elements is constructed of a sheet of bendable resilient material which has a substantially flat permanent set, and each sheet is provided with three pairs of equally spaced apertures for interconnecting the building elements, each pair of connection apertures defining an axis which extends between the connection apertures, and the axes between the three pairs of connecting apertures intersecting at angles of 60.degree. to form an equilateral triangle centrally of the sheet, the sheets being interconnected by pins extending through apertures to form a hollow body. Four embodiments are disclosed, one in which legs extend from the central triangle portion, and two embodiments in which a six-sided sheet forms the basic building element.