Are boundaries barriers or delineations? Or something else? Are they helpful or harmful? Strayer argues that boundary classification is not meant to be rigid, merely a means to engage discussion of terminology. A way to think critically about how boundaries are defined. It matters, though, who is defining the boundary. Why is environmental justice relegated to a special interest while continued economic growth is not? Coastal structures like jetties offer physical boundaries of protection from the forces of waves on the beach, but this protection on the small scale comes at the cost of larger scale transformation at other locations.