Twenty-seven is an interesting number, since being 3 x 3 x 3 makes it not only a cube but a slip jig. Also, slip jigs often make good cross-step waltzes, which is another reason this is a good number. It also reminds me somewhat of 25, in being very pointed, though I think it has more motion and less stability to it. But all the nines involved make it also very secretive.
On a final note, apparently I share a birthday with Scott Adams.