Photographs of objects are ubiquitous in the work and presentation of museums, whether in collection-management infrastructure or in Web-based communication. This article examines the use of images in these settings and traces how they function as interfaces and tools in the production of museum knowledge. Because images are not only the main material presented but also become multilayered objects on which to act in order to access or produce knowledge, they play a key role in the involvement of users with museums. This development is analyzed in the context of the Tropenmuseum (an ethnographic museum in Amsterdam, the Netherlands) based on an ethnographic study of visual practices at and about the museum. Drawing on science and technology ...