First, to On-topic stuff -- Teri, I tried using your formula in my shaders; all it gave me was a very pretty rainbow effect. Very nice, and I'll likely be using that for another project I'm working on, but it didn't look much like a pyramid. (Except for those that I used to look at in the seventies when such odd colorations were expected. Although I'm not sure if the colorations were really in the posters or just in my mind....) Then, on to Alan Parsons: He was an assistant engineer on the Beatles Abbey Road album, but won a Grammy for his engineering work on Pink Floyd's Dark Side of the Moon. He also invented the analog precursor to the sampler; it was called the Projectron and could play tape loops at varying speeds depending on what key you pressed. I lived in Texas (though I wasn't US Property at the time) about twelve years ago. You're right, Willf; it's a different country. Lots of Cheddar, though....