The main two pages bounce at their left (or right) edge.
I should find it convenient if they would rotate regardless of shifting the
page to the right or to the left.
I find myself unable to remember whether I have to shift the current page left
or right,so I end up with a 50% winning chance to shift to the corect direction.
I encountered the loop through behaviour with the primary nav pages on the ICS
menu and I liked it very much...