Do you have any kiddo's that get upset and push their desks over? I do! I have one little guy that can sometimes get frustrated and push his desk forward so that it flips over. I did not want to have to re-arrange the desks into groups, so I racked my mind to try to decide a way to keep my u-shape arrangement. And then it hit me! Add another desk in front of his!
I tied the legs of the desks together, so that when he pushed his desk, it would only rock and hit the one in front of his. I had to do something, because it was only a matter of time before someone got hurt from the desk flipping over.
I hope you enjoy my little trick :)