Wall unit

A wall unit having a frame including a pair of frame members arranged in generally vertical positions at opposite sides of the unit and defining respective channels which face one another;

• a stack of elongate members extending transversely of the unit between said frame members with opposite end portions of each said elongate member received within the channels of the respective frame members and dimensioned to permit free sliding movement of the elongate member along the frame member channels, each elongate member having parallel upper and lower surfaces and the elongate members being arranged in superposed relationship and resting on top of one another under the effect of gravity with the lower surface of an upper member supported on the upper surface of member below, wherein each said elongate member comprises a solid one-piece extrusion of uniform cross-sectional shape throughout its length having parallel upper and lower surfaces, the extrusion having a cross-sectional shape formed by respective top and bottom webs defining said upper and lower surfaces, a central web extending between the top and bottom webs generally centrally thereof and disposed generally normal to said upper and lower surfaces, respective intermediate webs which extend outwardly from said central web generally centrally thereof and which having respective upper and lower lips at their outer ends, said lower web including similar upwardly extending lips at its outer ends, whereby the webs define four laterally directed channels two at each side of said member and each of which has a lip extending along its lower edge so that an article supporting element to be fitted to the unit can be engaged in any of the channels defined by the elongate elements of the unit and can be engaged over the lip of the relevant channel and thereby retained in the channel at any of an infinite number of positions spaced therealong.