Fold a Tetrahedron and a Box from the Same Net

Koichi Hirata discovered a shape that if folded one way will create a regular tetrahedron and if folded along different lines will create a rectangular prism (i.e. a box). This is a form of the

Steps

1. Cut out the pieces from the pattern.
   
2. Fold along the dashed lines to form the different solids.
   

References

• (Demaine and O'Rourke 2007, 423-5)