Menger Sponge and vice versa

They are displayed in the Institute Library of Mathematics in the 3rd floor of Science Park 2

picture of Menger Sponge

picture of Menger Sponge

picture of Menger Sponge

Starting the vice versa part

picture of Menger Sponge

picture of Menger Sponge

picture of Menger Sponge

picture of Menger Sponge

Balancing act
picture of Menger Sponge

Johannes Kepler Universität Linz, Institut für Angewandte Geometrie, Altenberger Str.69, 4040 Linz