I've never done it myself, but I know quite a few people who have left companies I've been at and then come back. In all cases the companies were happy to leave

I've never done it myself, but I know quite a few people who have left companies I've been at and then come back. In all cases the companies were happy to leave the door open from the beginning. For me it is a sign of a good company. When I was leaving said company myself, it wasn't because I was unhappy there but because I felt like I needed to try something new. So I can imagine others doing the same and then deciding that the grass isn't necessarily greener after all. I am very happy where I am right now and it was the right decision, but I can totally imagine happily ending up back there one day. In some ways it still feels like "home".