Definitions PG&S establishes relationships between properties of graphic objects. Graphic objects (like arectangle or a button) can be thought of ashaving 10properties which define their bounding rectangle: a lef~ right, top, & bottom side, ahorizontat & vertical center, and a lef~ right, top, & bottom location. The difference between a side and a lccation is that if you change a location of an objec~ the object will stay the same size and move, whereas if you change a side of an object, the object will stretch or shrink.