Roman Pisa DISTRESSED ROCK FACE FINISH IN CURVED AND STRAIGHT LINES A distinctive new element in the Pisa II system is Roman Pisa. These easy, ready to use units have the same adaptations and shapes as the Pisa II, but are enhanced by an antiquing process that distresses and naturalizes the unit. The end result is a look reminiscent of the "weathered" appearance that is so popular in today's landscaping. These modular units interlock with a built-in setback, and automatically form correct slope, ensuring stable walls up to four feet in height from grade. Roman Pisa is supplied in rectangular units. The wedges, when placed together, help to form curved walls with a continuous tight fit. Units can be placed around inside curves with spaces left at the rear being filled with granular draining material. Staggered blocks in successive courses maintain the interlock. Best of all, the Roman Pisa looks great in combination with other Unilock systems.