That's a directional field for a differential equation, and it is
very cool.  What is the equation for it?  I'd like to know because I have
played with differential equations on povray a bit too.  The attached image
(54.7 kb) is an example of output from my system of diff-eq d-field plotting
script, with all of the showy features activated.  The equations are:
x_prime = Y-cos(X);    y_prime = X-Y;  What do you think?

-Ben Scheele

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