Abstract: A modular display system of interlocking components, and more particularly, a modular cubic display frame, comprising two sets of four mitered frame members, the two sets defining opposing rectangular end planes, and a set of longitudinal frame members extending perpendicularly between the corners of the two end planes. The end and the longitudinal frame members are interconnected at each corner utilizing a threaded bolt or screw having a lipped head. The lip projecting from the head engages a corresponding groove formed in the outer surfaces of the mitered corners of the end frame members, while the externally-threaded shaft of the screw engages an internally-threaded bore in the end of the longitudinal frame member. All of the frame members have longitudinal channels formed along each side and one corner, for attaching two modular display frames to each other, or for attaching a variety of auxiliary devices to a display frame.