Are there any rules for using prepositions with the phrases "the top right, the bottom corner, ..."? We know that we can say: at the top, at the bottom, on the left, in the middle, in the corner, at the corner. Now, when we need combine them, we say that: on the top right, in the bottom corner, in the left corner. Are there any rules for the last point?, in other words, why we can't say that "at the left corner" and "at the top right" for example? This is the first questions for italki. Best regards