Joe wrote a post by that title, and doesn't it just fit? We need to quit putting kids into boxes quite so literally. If you're at all interested in the history of the time-out room (aka locked closet in my lingo or "safe" room in teacherese), you should click over and take a look. A short excerpt:
"For too many years, in too many places, children who have occasional outbursts in schools have been seen as disruptions, nuisances, drains on resources, undisciplined, bad, and generally problems to be controlled. And the tools that have been most often resorted to to remedy the situation have been the ones seen to be most expedient-the use of restraints and seclusion rooms."