Maybe it'll grown on me, but my initial thought was "oh dear".
EDIT: The image posted by steddenm doesn't tally with what you see when you follow Robert Williams' link. The two middle bits should be abstract B's, not plain rectangles. Going with what others have said, I assume that the version with plain rectangles is a particular single frame from however it animates.
If you want an innuendo, I'll give you one.