One Central California's wine country homeowner protects a circular driveway from erosion with light chocolate-toned stackable blocks.

You can choose from many types of retaining walls, including poured concrete, conventional stacked blocks, and stackable decorative blocks that need no mortar.

In addition to enhancements to the framework, it's possible to stack security modules, allowing multiple security modules to coexist and provide maximum coverage for Linux's security needs.