Symbolism.

The paperweight is a key symbol which Orwell uses in a number of different ways. It is both beautiful and fragile; it represents the past, and the life Julia and Winston have in the rented room (note: it is broken when they are arrested); it also represents our way of life which Orwell wishes to warn us is also fragile. Other symbols worth analysis (and there are more) are the “Golden Country”, chocolate, and “2+2=4".