Even modern literature uses the phrase. We don't think that someone actually believes the earth has corners. *it usually is pretty easy to tell someone is using poetic language to describe real events.*
Sure, but even the Is passage can be said to be poetic language.
And even both, modern language and scripture, describes things differently depending on which perspective they are trying to convey.
So when we ask the question: Does the bible describe the earth as rounded or cornered?, we can say "both" depending on the perspective of the point being made at the time, even though "rounded and cornered" are contradictory.
Another case in point from scripture that shows a contradictory statement can bee seen in two different scriptures:
The parables of Matt 13 tells us in one place that one sows all the seeds, and then tells us in another place that the devil sowed also.
So when we ask the question: Does GOD sow all the seeds?, we can answer yes or no depending on which perspective the two different statements were being made for.