'Black Relief' is constructed from squares and rectangles arranged in two rows on the upper and lower halves of a backing board. The uppermost surface of each block is finished in black perspex. The layers of the relief are painted in different colours, beginning with matt black, furthest from the spectator, followed by grey, ochre and red. The depth of the blocks varies, allowing some colours to remain visible as either surfaces or as the thickness of the relief. Apart from perspex Martin has used both the smooth and textured faces of hardboard to give variety to the surfaces. Both the colour and the layers, or folds, of the construction serve to emphasise movement within the spatial patterning of the work.