OAI is a search and visualization engine for high-resolution images of artworks - from all around the world and from every period in history - that belong to the public domain or to a type of Creative Commons license which allows their reuse. All images come with detailed information, relevant to the understanding of their historical and cultural context and which informs the user about their current location, source and license. OAI aims to contribute to the democratization of knowledge and, in particular, to make art accessible to anyone and anywhere in the world. OAI promotes not only the discovery of artworks, but also the editing of the details relating to those artworks and the growth of an open-shared database accessible to every user. OAI respects the privacy of its users by adopting completely anonymous tracking technologies.