At some time in your life, you may have to protect your artwork from harm. And some experts think that has to involve corrugated carboard corners.
If you ever have to deal with corrugated cardboard, be careful. It can cut you up. That’s how my arms got scratched and bruised, which you can see my video demonstration of how to fold corrugated corners. Approach it carefully from the front, maybe offer it some meat (not your own!).
Go Retire Psychiatrist 