> > > I was thinking more along the lines of specific descriptions such as: "And then the Lord drew upon the ground a perfect square, and this square had exactly three sides, and yet was perfectly round." (Yeah, sorry, I tend to always think of a math-related thing, first.)

I would have to agree with gremlinn here - the reason that not even God could draw a 3-sided square is that, by definition, a square has four sides. Any shape that has exactly three sides is simply not a square. Similarly, God can't make one plus one equal three because the definitions of "one", "three", "plus" and "equal" forbid it. While He could change the meanings of the words, that would make it into a completely different statement.