appendTo in 2 directions not working

appendTo in 2 directions not working

I set up this jsbin so you can see my problem.  My appendTo is working going to the right, but I need it to go to the left as well.  If I add the first 2 items to the right, clicking on those elements should bring them back to the left.  What am I doing wrong here?


Edit: Another question: Is there an easier/better way to do this?