a modular wall panel system in which individual panels are constructed with a lightweight aluminum frame . in a preferred embodiment , the frame is substantially filled with a foam core material and decorative display surfaces are affixed to opposite sides thereof . one edge of each panel contains a plurality of ball - shaped connector pins , while the opposite edge has a plurality of connector slots having a diamond configuration . a similar panel placed adjacent to the first panel may be mated thereto by engagement of the connector pins with respective connector slots in the other panel . the pins / slots are shaped and sized so that the connector pin may enter / exit the connector slot at a wide region thereof but not in the apex region thereof . secure coupling with fast assembly / disassembly is thereby achieved , without tools or detachable components .