a vertical arrangement of objects the objects may be of different shapes, sizes, and materials the objects may be arranged in a symmetrical or random pattern the objects may be held together with ties or straps the top of the stack may be flat or may have a slight angle
stack which is a vertical arrangement of objects stack which has the objects may be of different shapes, sizes, and materials stack which has the objects may be arranged in a symmetrical or random pattern stack which has the objects may be held together with ties or straps stack which has the top of the stack may be flat or may have a slight angle