Heavy metal
After Columbine, we remember writing a series of editorials urging schools to "harden" their campuses. No longer was America the land of Opie and Beaver. In modern America (circa late 1990s), things had to change. And if kids were bringing guns to school to slaughter each other, obstacles had to be put up. Such as locks and cameras and fences. And when new schools are built, the designs no longer could embrace the so-called "open campus" feel.