Your first thought is that someone had simply rotated the pic 90 degrees as a subversive joke - but that was actually the original intended cover! - initially approved but then the publishers got cold feet - what a shame!
Another covers for Lo, btw: http://www.librarything.com/work/913/covers
Another covers for Lo, btw: http://www.librarything.com/work/913/covers
Update: just another Lo's cover and the best one, if u wanna my opinion.