Foams in nature

[Tglad]

Lastly, there is the foam fractal-


It's a solid with a cluster of gaps inside it

A few large gaps and millions of tiny gaps.

And that's it, those are the five most simple fractal shapes.
https://sites.google.com/site/simplextable/1-simplex

[Catelee2u]

Foamy fractals are undoubtedly my favourites!