The document discusses making cultural heritage widely available and reusable online. It argues that cultural institutions should digitize their collections and make them openly accessible on the internet so that anyone, anywhere can enjoy and learn from the collections. Doing so allows the collections to have much greater reach and impact than being limited to physical museum spaces. The document provides examples of projects from the National Gallery of Denmark that have brought artworks to new audiences and contexts through open digitization and online platforms like Wikipedia. It advocates for cultural institutions to measure their impact and success in terms of online engagement and use, not just physical visits.