Patent ID: 7207146

Claim:
A block for use in constructing a wall, the block comprising: a rough textured, non-faceted, substantially convex front surface; a rough textured, non-faceted, substantially convex rear surface; a pair of opposed side surfaces extending between the front and rear surfaces; a top surface, the top surface comprising a first channel, with each channel including inwardly tapered side walls and a bottom surface, and a second channel, with the first and second channels spaced from each other by a substantially planar top section, and with at least one of the first or second channels extending substantially across the width of the block between the opposed side surfaces; a bottom surface, the bottom surface comprising a substantially planar bottom section and a projection, with the projection extending substantially across the width of the block between the opposed side surfaces, with the projection having a substantially uniform cross-section, with the projection being located adjacent the bottom section in substantial vertical alignment with one of the first and second channels, and with the projection configured to engage a channel in an adjacent course of blocks.