Albatros Auto Bookmark

The “Albatros” bookmark is a simple piece of paper that works as a pop-up. Each time you turn a page, the “Albatros” moves with the reader. This is the only bookmark that follows the user's reading by itself.

Hyeon Jeon Lee also created a similar design out of plastic, though commenters are saying that it's plagiarized from the original creator above.

Personally, I think it's important to balance the flexibility of the bookmark with the tension it creates, as not to rip the book when the user flips the page.  But overall, a great idea.

Source: Oscar Lhermitte