a graphical user interface includes a plurality of pie menu levels concentrically arranged . located within the center most section are menu selections generally of greater importance , highest probability of use , historical favorites , category headings , tabs from a tab menu , as well as other high level menu items . levels extending from the center decrease in frequency of use while increasing in granularity of menu items . variations in geometric shapes , number of divisions , levels , use of color or texture enhance the use of the pie menus .