Abstract: A modular furniture assembly includes two more modular body sections horizontally interlocked using a coupling mechanism which may be male-over-female type, female-over-male type, one male two females type, or one female two males type. The body sections have a substantially same geometrical top view figure. The male members and female members in the coupling mechanism have a substantially same geometrical top view figure as, but with fitting dimensions smaller than, said body sections' geometrical top view figure. The top view figure is comprised of a symmetrical trapezoid and a rectangle with a width identical to the trapezoid's wide segment. The trapezoid's two symmetrical hypotenuses are at 90 degree angle from each other.