Art is a collection so as News, Mail and so on.
Links can be arranged in a hierarchy of collections.
The set of all those collections seen in the picture on the left hand side (Search, Mail, News, Art and so on) is also called a collection named "NotJustbrowsing".
This collection may be representing a "Book", "Notes" a "Photo Album" or just a collection. This collection of collections reside in the Shelf and can be opened by double clicking left mouse button.


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