The personal computer physically resembles a bookshelf and functions like a bookshelf as books and magazines – or in this case, hardware – are placed on it. The foundation of the computer is its central processing unit, which is a 7-inch cube. The Bookshelf operates with add-on hard drive attachments that are supplied by digital service providers so they can protect copyrights while still accommodating user convenience and portability. The hardware attachments – containing multiple movies, games, or magazines – will vary in width, but its other dimensions will be the same as the Bookshelf cube. As the hardware attachments are added, the Bookshelf becomes its own multimedia library custom-built by its owner. For example, users can watch movies by connecting to a television or computer monitor.