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I think that those vertical columns you're seeing in the render are actually internal columns. You can see them in this pic that was posted earlier: http://img26.imageshack.us/f/img4811z.jpg/
The angled columns simply form the outline of the curved cutout.
But the curved cutout goes into the ground vertically according to the render. I still don't see where these angles columns coming out of the ground exist in the rendering.
edit: Perhaps I'm overestimating how much those columns are actually angled.