Please DO keep posting that. A picture is worth a thousand words.
"Managers of such intrusion-sensitive operations are scrambling to protect their power plants, water plants and city and commercial buildings to address Homeland Security recommendations and secure their workers and infrastructure. But many are faced with the realization that the old standards they're using to protect the perimeter of their existing or planned facilities, such as the chain-link fence and traditional masonry, may no longer suffice.