Concrete block
FIG. 1 is a front perspective of a concrete block cast with a concave-convex decorative face; 
     FIG. 2 is a rear perspective of a concrete block cast with a concave-convex decorative face; 
     FIG. 3 is a front perspective of a concrete block with a cleaved decorative face bounded by concave cast portions; and, 
     FIG. 4 is a rear perspective of a concrete block with a cleaved decorative face bounded by concave cast portions.