<aside> 💡 Also known as Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge.

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Image source:

Mattcomm, https://de.wikipedia.org/wiki/Menger-Schwamm#/media/Datei:Mengersponge.gif

CC BY-SA 4.0

Related to:

Sierpiński Triangle

Cantors (set, dust)