Cool looking graphs

[CanadaAotS]

Look at this equation:

 

[math] z(x,y) = (\cos(\sqrt{(x^2 + (y + .913*2\pi)^2}) + \cos(\sqrt{(x^2 + (y - .913*2\pi)^2}) + [/math] [math] (\cos(\sqrt{((x + .913*2pi)^2) + y^2}) + (\cos(sqrt{((x - .913*2pi)^2) + y^2}))*4[/math]

 

Pretty crazy, eh? lol, It's supposed to be some kind of complex wave thing... the graph looks like this:

 

 

If anyone else has any cool looking graphs, post a screenshot of it (or a link to a screenshot) on this thread, with the equation used to make it.

[starbug1]

I think I've seen a graph similar in sonar. I might be wrong, but I wanted to know if this is even practical. It doesn't seem like any definate plot, but more like a pattern. Maybe if you knew where you got the equation you could better understand its meaning/uses.