permanent mounting a fundamental feature and inherent advantage of the present invention is the repeated use of mat 108 for different displays or an easy change of mat 108 for a different color accent the method that eliminates need for individual mounting of artwork 112 to mat 108 is introduction of a sheet of foldover mylar 114 foldover mylar 114 or similar substance with equivalent flexibility and transparency functions as a retainer to display artwork 112 through window 110 as shown in the exploded assembly drawing in fig3 foldover mylar 114 uniformly encases artwork 112 in a sleeve like fashion in order to secure placement of artwork 112 within foldover mylar 114 static electricity may be used present mounting method may for example be employed by rubbing a household cloth on inner fold of foldover mylar 114 creating static electricity in the present embodiment foldover mylar 114 is sized to snugly fit dimensions of assembled frame legs 102a 102b 104a 104b in picture frame assembly 100 by using foldover mylar 114 not only is the need for permanent mounting eliminated but also need for tailor cutting mat 108 is not necessary use of foldover mylar 114 permits display of varying shaped sized and arranged artwork 112 in same picture frame assembly 100 by way of example fig4 illustrates the simplicity of mounting various materials with foldover mylar 114 fig4 is an exploded assembly drawing showing a series of various sized and arranged collector 39 s materials such as stamps unusual monetary currency and wedding invitations shown ensleeved in foldover mylar 114 wedding invitation 112a is ensleeved in foldover mylar 114a monetary currency 112b 112c 112d is ensleeved in foldover mylar 114b sheet of stamps.