Reserve collections, study collections, research collections, stored collections: all these terms are used for the collections a museum may have that are not displayed. All have overtones of second class, yet objects that are in the museum’s collections store rather than in its exhibition galleries may be just as important, or more so, than those that are exhibited. The Science Museum’s outstanding collection of astronomical instruments, for example, may be visited in store on request, but very few of these objects are exhibited in the museum (see Fig. 10.1). So I refer to this material as, simply, THE COLLECTIONS.