of fig1 the tangs 50 52 on the respective blocks extend into sockets 54 56 in the cornerpiece it may be appropriate to extend the sockets further into the cornerpiece than shown because it may be less expensive to thus provide the sockets the tangs on blocks 42 44 enter into passages or sockets 57 58 in the respective 8 u2032 u2013 10 u2032 long molding sections 46 48 the sockets being shown in broken lines at 57 58 a third embodiment of the invention is illustrated in fig6 7 and 8 this embodiment includes a cornerpiece similar to that of fig1 in fig6 there is shown a block 72 similar to block 42 of the embodiment of fig1 and like block 42 has thereon two tangs to engage in slots or passages not shown in adjacent molding sections 74 76 in the manner in which the tangs of the embodiment of fig1 extend into the passages or slots indicated in fig1 by broken lines as with fig1 the molding section is typically 8 u2032 u2013 10 u2032 long and comprise decorative molding the broken line showings or areas 82 of fig6 represent spaced apart members like member 70 which are secured as by screws to a wall and attached by posts with leaf springs thereon extending into t shaped slots such as are shown in fig9 10 and 11 fig8 to 11 illustrate certain components relative to the embodiment of fig6 spring components are provided on posts to engage in openings or grooves in the manner indicated in.