area surrounding the sculpture 10 which is visible through the transparent shell 14 as is conventional in the framing art the four frame members 22 are locked together at the corners of the enclosure 12 by means of right angle bars 42 best seen in fig2 and 6 the framing members 22 are formed with u shaped channels 44 at the rear of the flanges 23 and are mitered so as to meet properly at the corners of the enclosure 12 each arm of the right angle bar 42 at each corner is inserted within the channel 44 of one of the two adjoining frame members 44 then set screws 46 which are threaded into the respective arms of each angle bar 44 are tightened against the rear of the adjacent flanges 28 so as to lock each pair of frame members 22 together to form a solid corner assembly the front plate is preferably recessed behind the front margin 18b of each of the sidewalls 18 in the manner illustrated in fig3 this has several advantages the front plate 16 is preferably bonded to each of the sidewalls 18 by means of some suitable adhesive and this inevitably introduces some small bubbles into the interfaces between the front plate 16 and each of the sidewalls 18 by recessing the front plate 16 in the manner indicated as opposed to placing it over the front margins 18b one assures that the interface area 48 faces sidewardly rather than forwardly and thus is not as readily visible to those who are viewing the artwork 10 who would normally be expected to stand more or less directly in front of the enclosure 12 in addition this preferred method of recessing.