I created this sculpture using K3DSurf – Unfortunately it no longer runs on my Mac, but before it became incompatible, I managed to generate several hundred 3d objects – so I have plenty more of these Isosurfaces and mathematical objects to use in future projects!  The plinth was made using Wings3D, all rendered and surfaced with Marmoset Toolbag 2; in which I used one of the many superb HDRI panoramas by Greg Zaal over at HDRI Haven – (thanks Greg!)