Question: How to make a page-holder protruding outside the book, without using any other materials?
Options:
Tear the top corner of the page a little bit and place it so that it sticks outside the book when closed.
Tear off the bottom corner of the page  a little bit and place it inwards so that it sticks outside the book when closed.
Answer: Tear the top corner of the page a little bit and place it so that it sticks outside the book when closed.