First of all you need an old book.

Find out where the middle of the book is and use a sharp tool to mark it, for example a knife or scissors.

Now all you need to do is to start folding the pages as I show you on the picture.

Fold every page in the whole book!

When all of the pages are folded the book should look like this :-)

This is a nice way to let an old book get a new life, as a still life! There are other ways to fold the pages to creat other looks to the book, experiment!