an article support such as a shelf or a table top has a frame that , in its heated state , slidably receives a glass or plastic planar sheet into grooves along two opposing edges of the frame , until an end of the sheet abuts a third edge of the frame that joins the two opposing edges . the edges of the frame have lips that rest on a portion of the top surface of the sheet . when cooled , the frame contracts such that the edges of the sheet are tightly engaged within the grooves of the frame and the lips tightly abut the top surface of the sheet , thereby creating an article support that resists spills around its periphery . the frame may be reheated to expand the material of the frame , permitting removal of the sheet from the frame . thus , the frame and the sheet may be recycled .