Very nice. I've used a similar effect for a few years on my homepage - http://arpad.co.uk http://arpad.co.uk - albeit with a far more primitive algorithm ;) An

Very nice. I've used a similar effect for a few years on my homepage - http://arpad.co.uk http://arpad.co.uk - albeit with a far more primitive algorithm ;) Annoyingly I didn't make a note of where I found the algorithm and I can't find the source now, but I remember being struck by its simplicity and deciding I had to find a use for it. The meat of it is: z = (sum of surrounding cells) - z; z -= z >> 5; Does anybody recognise it?