I hope not without visible rationale, there are variations on this arguably equally suitable, but my criteria were: it should encompass as best possible all of the last ten or more years or so, and best fit to the price movements in terms of a channel & fib ratios, most specially it should return to the median most often. There is no suggestion on my part that it will do so again, (at least not soon ;) and it is all entirely moveable. But a useful reference, I hope. (NB: it looks better if you click the 'zoom in' a time or two, also some of the internal lines closer to the median are left out)