a connecting rod through the two coiled connectors which are moved sufficiently close so that the coils overlap thereby trapping the surface effect material which is viewable through the panels 40 to 50 as these panels also are of mesh construction the effect is in fact shown in fig6 where the dashed line areas are intended to represent material which in this embodiment is turf so that the wall eventually will have a turf surface appearance this is applied over the whole of the wall surface instead of placing turf between the support and cover mesh panels other suitable horticultural material can be used such as the material known as u201c seedam u201d which is a material which is supplied as a thin layer and in rolls and is simply unrolled and placed on the ground the layer comprises soil bound by means of a woven fabric and the soil contains a seed material from which green vegetation grows fig8 is included to show a section of this material and in this figure the growing material is indicated at 52 as it grows through the cover panel 44 and the support panel 26 is also illustrated between the support panel and the cover panel is the fabric 54 which forms the.