'I've been down so flipping long, that it seems like up to me.' So goes the old song by The Doors. More or less. I have bowdlerised the lyrics here. Ah, Jim Morrison. One of the first generation of rock rebels. He lived too fast, he died too young. But he made a very valid point in that musical number. Down and up are relative - and interrelated. Generally speaking, when you go in either direction it is never long before something changes and you start going back the other way. You are now watching a down turn into an up.