The isosurface is derived from an image_map pigment based function.
Turbulence helps hide the creases and provides extra detail ala
http://3dgallery.dhs.org/tutorials/iso_tutor.html.
For some reason I find the lighting in the image not very hospitable (at
least on my monitor). Sure there is green grass and water, but I would
not want to hang out there.
Abe
