Apparatus and system for keeping a cover releasably secured over an opening

A book-clock system that keeps the front cover and the back cover of a book selectively closed about the pages of the book, the system comprising:

• a clock movement housed within a space hollowed through the pages of the book;
• a clock shaft connected to the clock movement for moving clock hands according to the clock movement,
• the clock shaft protruding from the clock movement for passing through a hole in the front cover of the book, and
• the clock shaft supporting the clock hands on the outside of the front cover of the book;
• and
• a fastening element having an opening near one end for passing the clock shaft through the fastening element prior to the clock shaft being passed through the hole in the front cover of the book so the end of the fastening element with the opening is positioned between the front cover of the book and the clock movement,
• the fastening element being positioned about the clock movement so at least a part of the fastening element is adjacent to a portion of the clock movement facing the back cover of the book, and
• at least the part of the fastening element adjacent to the portion of the clock movement facing the back cover of the book being ferromagnetic;
• a magnet positioned on the back cover of the book so when the back cover is closed, the magnet meets the ferromagnetic part of the fastening element and a magnetic force is exerted between the magnet and the ferromagnetic part of the fastening element,
• whereby the magnetic force between the magnet and the ferromagnetic part of the fastening element holds the back cover of the book closed unless the back cover of the book is opened forcibly enough to overcome the magnetic force.