Business Card Platonic Solids


You can fold a simple unit from a standard U.S. business card that can be combined with other units to create a tetrahedron, octahedron, or icosahedron. The tabs on the business cards hold the other cards in place. It is really quite elegant.



  1. fold bottom right to top left corner Fold a business card in half so that the bottom right-hand corner touches the upper left-hand corner.
  2. fold flaps over Fold the flaps over the equilateral triangles that you just created. Make your creases sharp by pushing them flat with your thumbnail, a pen cap, or some other improvised tool.
  3. left-handed unit Open the card slightly. This will be a "left-handed unit."
  4. fold right-handed unit fold right-handed unit fold right-handed unit Create a "right-handed unit" by repeating the process above except that you start by folding the card so that bottom left-hand corner touches the upper right-hand corner. This will be a "right-handed unit."
  5. Make as many of these units as you need to produce the polyhedron you want: one of each will make a tetrahedron, two of each will make an octahedron and five of each will produce an icosahedron.
  6. Slip the units together so the flaps hook over and hold the other units in place. You don't have to use glue. However the icosahedron is quite tricky to make without glue because the model doesn't say together until the last unit is in place.