The spatial dimension of collections includes the physical arrangement of the media, their classification, and catalogues. But what form do collections take on the Internet when they no longer have a material presence? The article looks at examples from several websites, from France and elsewhere, to identify a number of possible approaches and solutions: presenting heritage collections, virtual exhibitions and visits, links with bookshops, and added-value catalogues. If libraries do not have a clear online identity, their future on the web is under threat. Giving collections a symbolic spatial dimension could be one way of making them more visible as organised compilations of knowledge.