in fig6 other examples of three dimensional patterns for the layer applied to an impression roller are shown in fig1 12 a layer 63 displaying a geometric pattern of straight intersecting lines 64 is indicated in fig1 depending upon the desired impression in the concrete wall the lines in the layer may be either raised or depressed the layer 66 shown in fig1 illustrates a brick 67 and mortar 68 pattern to create a more realistic impression the rectangular brick portions would be depressed and the dividing mortar portions would be raised in the molded layer 66 in that way the opposite three dimensional pattern would be impressed in the concrete wall yet another example of a layer 69 is depicted in fig1 in this pattern upper lines 71 are arranged in horizontal alignment and lower lines 72 are arranged in vertical alignment it should be apparent that by using such a system where the pattern is molded into a layer forming the outer periphery of the impression roller the greatest flexibility in accomplishing the objects of the invention is achieved however alternative constructions for the impression roller may be used rather than applying a separate molded layer to the roller a three dimensional texture could be sprayed onto all or part of the roller three dimensional objects themselves containing patterns or providing an object pattern could be affixed to the outer surface of the roller either mechanically or adhesively also the impression roller itself may be configured with flat sectors or sections to provide a three dimensional pattern it has been determined that a resilient layer or.