Vibrant purple spiralling fractal. postcard

The vibrant swirling shades of purple in this image are very suited to this product; the swirls will give an impression of luxurious depth to an otherwise flat surface. For those who are interested, this design is a fractal. Believe it or not, the structure shown is based upon the properties of numbers. Each point is a point on a graph and its colour depends upon how that number behaves when processed in a fairly simple equation. It is quite remarkable that such a process can produce such beauty. It also poses a serious question to the secular worldview: why do numbers contain such hidden majesty?