Riemann zeta in 3d, one line shows how the imaginary part (spiral) operates independently, and shows the real part is a line from the origin to some part of that spiral, depending on n and x initial. Then there is the sum that represents both, this is a straight line with "microscopic" spirals when x (kinda the real part?) is sufficiently large (x greater than or equal to 1). When x is below 1, the sum starts to wrap itself up, with y taking over, the closer to 0, the more closely the sum follows the spiral.