Some base angle cabinets may be customized into a trapezoid shape to create a flush facing finish to the row of cabinets. These types of base angle designs are custom built to compensate for an awkward directional change or special need. Generic base angle cabinets are offered in a diamond or triangle shaped bases to fit right-angled corners. Occasionally, a 120 degree angle might be practical for changing the run of a cabinet that follows an irregular countertop. Within the base angle cabinet, rotating shelves are common if the depth of the cabinet is great than 24 inches. Regardless of the internal shelving scheme, the door hinge placement will be critical in maintaining good functionality for corner cabinets.