Abstract: A modular wall unit for a modular wall system includes a first elongate reinforcement member comprising at least one tubular portion for connecting the wall unit to a further wall unit of the wall system. The wall unit also includes a body at least partially surrounding the reinforcement member along its elongate length. The reinforcement member provides strength to the wall unit and allows a connecting element to engage with the at least one tubular portion. The connecting element can connect the wall unit to a further wall unit. This allows formation of a wall system where multiple wall units are interconnected via the reinforcement members and connecting elements. A kit including a wall unit and one or more plugs for assembling a plurality of wall units, a method for forming a wall unit, and a hanging device for supporting a frame are also described.