Fred: Better. But I still have no idea what principle is being demonstrated .... WFL Just illustrating draconic anatomy. The dyadic construction, the fivefold partitioning of the area, and the abundance of triple points. Especially if you have a pausable gif player. If it's reversible to boot, you only need one of these: gosper.org/coruscf1.gif gosper.org/1fcsuroc.gif --rwg I've doubtless overrepeated the anecdote of Mandelbrot on the way to the airport asking me the dimension of the Dragon's boundary, having seen one for the first time at Knuth's house only days before. I told him I'd call him with the answer after working it out from the recursive graphics description we used to correct the base i-1 figure in AoCP II. I got a messy cubic with a messier solution. He asked what was the cubic. I told him. "Yes, that's right." "You already knew? That's not your kind of formula! How did you get it?" "I looked how the wiggles fit into each other."