Good question. I wrote some Javascript to plot complex functions as 2-d vector fields, which is not really what you're asking for, but helped my intuition about

Good question. I wrote some Javascript to plot complex functions as 2-d vector fields, which is not really what you're asking for, but helped my intuition about simpler functions. I haven't tried it on zeta. You can plot magnitude and phase as a colored surface, as you probably know.