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That is nice! I couldn't resist the curiosity about the other operators, so I extended your code to include them all on one page for easy comparison;

http://play.golang.org/p/O0F1FiAl6C

mod looks super interesting too.

try y^2 + x^2 and y^2*x^2

Go compiles so fast, would be nice to have it available as a scripting language in the browser. But that's me superficially thinking, there is probably a lot of various complications and security issues.

Not exactly what you want, but works to the same effect: https://docs.google.com/document/d/1oA4rs0pfk5NzUyA0YX6QsUEE...

You get some interesting box patterns if you use bitwise operators.

Oh wow the multiplication one is cool