The standard SNES controller adds X and Y face buttons to the design of the NES iteration, arranging the four in a diamond shape, and adds two shoulder buttons. It features an ergonomic design by Lance Barr, later used for the NES-102 model controllers, also designed by Barr. The Japanese and PAL region versions incorporate the colors of the four action buttons into the system's logo. The North American version's buttons are colored to match the redesigned console; the X and Y buttons are lavender with concave faces, and the A and B buttons are purple with convex faces.