Back when I had a truck and a good back I helped friends move their couch into an apartment. It was close but I somehow managed to get it in. They told me later that they weren't able to get it back out no matter how hard they tried. Is this an example of the moving sofa problem?
I was expecting the new problem to be a turn with an varying angle (not 90°).
So where can I actually buy one of these sofas? I want to shock my mathematician friends.
The true "problem" with moving a sofa is finding available friends on a weekend.