Miscellaneous variants of fractal sponges such as the Menger sponge and the Jerusalem/Cross Menger sponge.
For example, here’s one that’s almost but not quite like Fig. 6.6.3 in Gerald A. Edgar, Measure, Topology, and Fractal Geometry, Springer-Verlag, 1990, p. 187.
Figures created with Mathematica 10.
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