The way in which physical objects , like rocks and trees , have being differs from the way that properties of abstract concepts or relations have being . For example , the way the concrete , particular , individuals pictured in picture 1 exist differs from the way the concepts illustrated in graph 1 exist . The way that physical objects , like rocks and trees , have being differs from the way that properties of abstract concepts or relations have being , for example the way the concrete , particular , individuals pictured in picture 1 exist differs from the way the concepts illustrated in graph 1 exist .