CubeGuard could help avoid office interruption 

The 50 million American workers who labor each day in cubicles without office doors to shut might have a new tool to help avoid interruption. Instead of fantasizing about duct taping coworkers’ mouths shut, they can install a CubeGuard Cubicle Message Barrier, a retractable message banner that can be mounted across an office doorway or cubicle with messages [...] [...]