Methods, systems and apparatus, including computer program products, for user interfaces. A user interface uses metadata of digital objects to navigate through a data structure that includes multiple containers to organize digital objects, such as digital images. Based on the metadata, the user interface can ignore empty containers that have no associated digital objects. The data structure can be presented without the empty containers, or the empty containers can be presented but automatically skipped when a user navigates through the data structure. For example in a calendar view, in which each day represents a container for images, days without images are automatically skipped when the user navigates in the calendar view.