Abstract: A system for connecting wall panels in abutting edgewise relation, wherein abutting edges of the panels are formed with semi-circular recesses in them, includes pairs of spaced slots formed in the corners defining transverse semi-circular edges of the panel frames. Two connectors are provided having conical recesses for engaging the edges of the slots. The connectors are each fastened by a screw to an end of an elongate bar which fits within the recesses of the corners. When the connectors are fastened tightly to the bar, the engagement of the conical recesses with the corner edges draws the panels tightly together. By this system, the panels may be connected either in-line or at an angle of between 90 and 180 degrees, without the need for any special corner hardware.