what is concrete aggregate ? the manufacturing process is a patented engineering process whereby ordinary concrete that has been naturally cured and hardened, takes on an exterior surface with an appearance of glued or sprinkled decorative tiny colorful stones attached to the surface of the finished product. it is as if an artist has brushed a concrete canvas with their artist hand! in actuality, the decorative stone is extremely imbedded ( not merely glued ) and permanently etched into the surface.