The Met and ArtStor have announced the Met is sharing open content for 375,000 images of public domain works in the ArtStor database.

Users can choose a theme or a subject in art history and gather a sampling across cultures. In portraiture, a line can be drawn from antiquity through today, and illustrated with highlights
Other advantages to the digital collection include thousands of fragile drawings and manuscripts that have been restricted or unavailable are now exposed to scholars and students. In addition, detail and alternate views present objects in their entirety, including surfaces and features that are hidden in a conventional exhibition context. The images can be viewed when you are logged in to ArtStor.