What you will need

  • Six business cards for each basic cube

In the figures here, the cards are pictured as having a white side and a gray side, and the cube ends up white on the outside. You'll have to decide how you'll use your own cards to determine the look of your cube. I'll describe white as the "outside", and gray as the "inside".

Creating the pieces

The first step is to fold the cards into pieces suitable for assembling into a cube:
Six steps of folding card pieces
Six steps of folding card pieces

  1. Take two cards, and place them across each other, with the inside faces together. Try to make the 90-degree angle between them as accurate as possible, because each card serves as a guide for the folds in the other. Getting the two cards to cross precisely in the center is not important, since the tab lengths can vary without affecting the final cube.
  2. Fold the ends of the bottom card up over the top card. Make the folds nice and crisp: the crisper the fold, the snugger the final cube will be.
  3. Flip the pair over so that the bottom folded card becomes the top card.
  4. Fold the other card's ends up.
  5. Pull the two cards apart: you've made two cube pieces. If you've made the folds tight, the pieces will be more "closed up" than shown here, that's good.
  6. Do steps 1 through 5 two more times. Now you have six cube pieces. You are ready to begin assembly.

Assembling the pieces

Now that you have six cube pieces, you can assemble them into a cube. This requires a little bit of dexterity, but is not as hard as it might seem.
Six steps of assembling card pieces
Six steps of assembling card pieces

At each step, make sure that the new card you're adding to the cube is hugging the existing cards with its folded tabs. Again, the pictures show the tabs flared out a bit so you can see the structure, but if you have made sharp folds, the tabs will lie flat against the other cards, making a nice clean cube.
At the last step, you will need to carefully pry open the remaining tabs to get the last card in properly (under the other cards' tabs, but with its tabs over its neighbors).

You have just created a Level 0 Menger Sponge!

What next?

Panelling your cube:

  • Make more cube pieces, and panel the outside of your cube to get a nice tab-less look. This will also help stabilze your structure. Take another cube piece with the tabs folded in and position it so the tabs are perpendicular to the tabs on one of the cube faces. Slide one tab under the tabs on the cube and then tuck the other tab in to the cube.


  • You can interlock the tabs from two cubes to attach them, and build from there. Connect two cubes using the same technique as panelling.



You are now on your way to making a Level 1 Menger Sponge!

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This is what a Level 2 looks like: