To keep your desk or room clean, the book Lighten Up! Free Yourself From Clutter espouses a simple but easily-overlooked tenet: "Everything has a place." The thinking goes that if there was a designated storage place for every piece of crap on your desk, and if you were disciplined enough to put things back, everything would be tidy.
I think that's the allure of something like a gun case.
Most of us only see them in movies about assassins, and they can practically make being a trained murderer something to aspire to. I wouldn't have the nerve to pump high-velocity rounds into a motorcade, but darn if I wouldn't want to have a job where I get to carry that cool case.
A music case is not nearly as interesting, because it just takes a single odd-shaped instrument and builds a box around it.
But the gun case contains all those disparate parts, each with their own perfectly-delineated cutout storage space in cushy foam. They make it all fit into this cool black rectangle. Order is brought to chaos. We are masters of our objects.
"I must've put like fifty rounds into that motorcade...it was off the chain, Bernice!"