Here’s an interesting way to keep away unwanted visitors that I read on l-e-mental, although I’m not ready to use one myself. Suck UK has created a hotel style sign that lets people know if you want company or not. The same sign can be rotated to display both messages, "Go Away" or "Come In" which are written in a very interesting reversible font. It’s probably a good idea for college students to display on dorm rooms. I certainly would have loved one outside my door when I was in college, so I didn’t get woken up by my Singaporean roomate who enthusiastically would test her culinary skills and concoct five-course breakfasts on sunday mornings. If you’re not keen on keeping away visitors so obviously, there is also a door mat with the same message, which can be turned around depending if you want to meet people or not.