Robert Lang, an origami master himself, helped Google put this together, and wrote up a description for their Doodle Blog. Read it here.
In his own blog, Robert Lang tells the story on how this project came to be. Robert has also included a crease pattern for us to try and fold the letters. Thank you Robert for your blog post.
Bravo Google for this idea!
Related Article: My Memories of Akira Yoshizawa