What determines "home" anyway?

I had a waft of homesickness this morning. It didn't last long, and they don't come around very often because I'm very happy living here in the big T.O., but I was looking at a beautiful teapot in a store window and suddenly I was taken back to Vancouver, and my many chats over a steaming pot of tea with friends, primarily my girl Tina. Made me feel a little homesick.