There are so many cool paper projects of folks creating origami and geometric amusements out of paper or cardboard or plastic that I was inspired to try. There is a plethora of 'flexahedron' examples out there (search for 'Andreas Markus Hoenigschmid' to have your mind blown).
However, I don't have any origami paper lying about so I looked on my desk and found some 3M Post-It Notes and Scotch tape and made do. This took five minutes, tops.
The goal is to make six tetrahedrons (A tetraherdon is a polyhedron composed of four triangular faces, three of which meet at each corner or vertex. It has six edges and four vertices. Wikipedia) The six tetrahedrons will then be joined by the adhesive tape at two of each of their edges as in the image above.
Step 1: Gather your materials
I used a 3" x 3" pad of Post-Its and a roll of matte finish 'Magic' tape.
Step 2: Fold the square in half
The great thing about the square Post-It is that I didn't have to cut or rip any pieces. Two squares will make one each of the six tetrahedrons that are needed.
Step 3: Fold twice to create two of the edges
The idea is to fold the square so that you'll make an isosceles triangle with two scalene triangle flaps.
- Lightly fold the square in half so that you get a crease that runs from the middle of one side to the middle of the opposite side, creating two rectangles on either side of the Post-It. The goal is to find and mark the center of one of the sides of the square.
- Fold a sharp crease from the top of the dividing crease to the left opposite corner of the square (above, picture on the left).
- Fold a sharp crease from the top of the dividing crease to the right opposite corner of the square (above, picture in the middle).
Make these folds in two Post-It squares so that you have two identically folded pieces of paper.