Trigonal Bipyramid (strip folding)
Learn to make a trigonal bipyramid (hexahedron) from one strip of paper. No glue or tape needed. This is a traditional design.
Take a strip of paper, almost any size will work. The one shown is 3/4″ x 11″. Fold the paper so it has the repeating crease pattern shown.
- One way to do this is to fold one end of the paper at a 45 degree angle to form a triangular flap.
- Make a vertical fold along the edge of the triangle. This gives you the first two creases.
- Unfold and use the existing creases to keep folding the same pattern across the length of the paper.
- Once the paper has been completely creased, it will be time to fold it into a trigonal bipyramid or a hexahedron.
- From one end of the paper, fold the paper partially along the creases. Do so with a light touch so the paper forms a 3 dimensional shape somewhat like a gem.
- Once the geometric shape is made, continue to wrap the strip of paper around until only a short segment of paper is left.
- Fold the corner of this segment of paper to decrease its width.
- Wrap the last segment of paper around the gem and tuck it under the existing layers of paper.
- Done! Shown below are different angles of the origami trigonal bipyramid.