OK!

So let's do tiger's stripes next.

If you fancy some good bedtime reading, the following paper looks at how non-uniform spatially repetitive patterns can occur and why.

http://www.intercult.su.se/refweb/kenw04/Kenwardetal2004.pdf

It looks as if I've committed the unforgivable sin of letting some science slip into the 'not quite science' board. I promise not to do it again smile

Blacknad.