This is sideways, I think.  When Aperture imports photos from my Olympus E-PL1, it doesn’t automatically orient them in the proper portrait or landscape mode, the way it does with my Nikon images.  As I went through fixing the images when I imported the Los Angeles set, I had trouble with some of the close-ups of the concert hall, because it sometimes is not readily apparent which end is up.  I looked at this one, and I’m essentially certain that it supposed to be oriented with the right edge at the top, but when I did that I didn’t likethe result as much as I like it this way.  So I switched it back.