Once again, lack of a good title.
Four isosurfaces, in pairs that are 180 degrees out of phase. Nothing in this scene modeled by hand, it's all equations that I spent forever working with.
For the curious and mathematically oriented:
f(x,y,z) = sqrt((ay - b sin(cx + d))^2 + (az - b cos (cx + d))^2) . . . . a and b are...uhh...something with radius, c is frequency, d is phase. It's pretty straightforward: the parametric equation for a 3D spiral is (u, sin(u), cos(u)); add in some functional transforms and apply the distance formula. The intention was that I would get a sphere sweep as a result of using the distance formula, but that didn't work out.