Tube connectors are provided for connecting tubes together to form a framework where the connectors are substantially hidden from view by ends of the tubes. Each connector has a support body and several anchor bodies that are formed integrally with the support body or independent from it. The support body has six faces with at most six anchor bodies. For any face of the support body that does not have an anchor body, it is formed to be coplanar with a surface of an adjoining anchor body, allowing an end of a tube with a suitably shaped end portion to cover that face of the support body. A U-shaped aperture with a slanted through passage are provided at a junction of at least one anchor body with the support body. This allows a tool to be inserted into the connector to fix a final tube to the connector.