Photography as a collecting category has matured considerably, with dedicated fairs and a serious secondary market, and it still lacks a central reference. That’s the institutional reading, and it’s the one with buyers who have budgets. Photo galleries means two things with money in both. The physical gallery that shows and sells photographic work, and the online gallery that every photographer needs as a portfolio. The physical reading suits a directory of photography galleries, an exhibitions and listings resource, an association of gallerists, or a market publication.