Here are some images of the Mandelbox with scales between -1.1 and -1.35, with a minRadius (r) value of 0. Of course, we could call these the positive mandelboxes if we like, just with a flipped around formula, negative is just convention.
A desert scene by Jesse using Mandelbulb3d, notice the hazardous holes
If you fall down one you could end up in this subterrainian spooky hollow:
These are by rrrola using the superb and lightning fast boxplorer.
similar to kleinian group 'indra's pearls' fractals:
This one has similarities to circle packing:
The number of sub-branches here follows the fibonacci sequence:
This shot by bib reminds me of bubbles on a water surface, a bit like Newton fractals:
Below are reverse images by Trafassel where the solid is outside the set, typically harder to render. Scale -1.1.
This is a fuzzy tree of spheres that reminds me of the Quasi-fuchsian fractal. They both show fractal disks along their outlines
I guess you could call this a scorpion tail, a great example of spirals in 3d