I once spent a year doing something similar. For pretty much anything that has a market (adequate volumes), if you plot volume on the x axis, price on the y axis and time on the z, you get lots of pretty spirals. It's my own little economics ATM theory: one day I'll discover why spirals exist, and publish.
Yeah, right I hear you say..

Anyway, the only tiny flaw in my otherwise cunning plan, was that this presentation/model was completely and utterly useless in making money.