If you leave your room uncleaned for too long, the dirt and dust will give a good growing place for Doorowls. No one knows how it happens, they just sprout out and start strolling in your apartment making notes and comments on everything you do. You can make good friends of them, but usually they just keep you awake all night talking about the weather or your tapestry or what are you going to eat tomorrow for breakfast so people just throw them out at some point.
