The present invention relates to a book which comprises a front cover (1), a back cover (2), and an elastic strap band (3) being attached to the back cover (2), wherein the elastic strap band (3) is configured to be wrapped around the front cover (1) for keeping the book (6) closed, the elastic strap band (3) is stretched at a predetermined stretching factor, when being wrapped around the front cover (1) for keeping the book (6) closed, and the elastic strap band (3) is configured to be further stretched for releasing the front cover (1) so that the book (6) can be opened. According to the invention, an image (4) is disposed on the elastic strap band (3) so as to be stretched with the elastic strap band (3), wherein the image (4) has a predetermined shape, when the elastic strap band (3) is stretched at the predetermined stretching factor and/or a movable member (7) is attached to the elastic strap band (3), wherein the movable member (7) is configured to be movable along the elastic strap band (3).
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