About this 3D model

This is the shape of a rhombic dodecahedron divided into four identical pieces in an unintuitive way. Luckily you don't need to be familiar with the final shape: when you discover how to fit the pieces together they will converge into a rhombic dodecahedron. Here's a YouTube video showing how the puzzle fits together: http://www.youtube.com/watch?v=MpmkWj1LPwE It's also described in my blog at http://mysd300.blogspot.com/2011/10/rhombic-dodecahedron-puzzle.html