Sounds as if it could be a metaphor. That is, it uses the image of something like a whole box to represent the whole globe or world.
No. A circle has no corners and a square has four corners. There is no object that has no corners and four corners.
The four corners of the great pyramid face the four compass directions of the world. The directions are North, West, South, and East.
no trees do not have four corners
the four corners of the earth.
four sides and four corners
That is called Four Corners, the only place in the US where four boundaries meet in this manner.|
Four corners
The Four Corners of Nowhere was created in 1995.
Nevada does not have a border at the Four Corners.
There are four corners on a square.
Examples? Buzz Click Tweet Beep Plop Pop
The Painted Desert is in Arizona just southwest of the Four Corners.