Here's a little nuance for you: Human head don't have corners, but a beard can. We can illustrate this by putting a cheese slice on a kid's ball. The cheese has corners, the ball isn't flat.
The Nuance of the Earth’s Corners
The Four Corners of the Earth
The phrase "the four corners of the earth" occurs a few times in scripture but every time it's in the context of the millennial kingdom, it's never used in any other context.