Paper cylinders or tubes may be connected to one another using any of a variety of connectors. The connectors incorporate features that may facilitate connecting the paper cylinders or tubes at a wide range of angles to form a variety of two- and three -dimensional shapes, while obviating the need to use tape or glue, thereby potentially improving the aesthetics of objects produced using the connectors. Further, objects produced using the connectors disclosed herein can be disassembled, facilitating reuse of the paper cylinders or tubes.