Each TERRASTOP?? unit contains contrasting texture faces on opposite sides: T-stone (rough) surface on one face, and T-brick (smooth) on the other. Simply by inverting concealed versus exposed faces, TERRASTOP?? obtains dramatic textural effects which give designers and builders a versatile palette using only one type of standard units. In addition to simple banding of stone and brick face courses, regular and irregular patterns can be easily created as shown here, as well as the TERRASTOP?? Ashlar shown in this gallery for more formal architectural applications.