US Patent 7506268 User interface with visual tracking feature

A user interface having a persistent graphical interface element is disclosed. The element may have an appearance of a mechanical structure that traverses one or more displayed tracks. Movement along the tracks may be animated in response to navigation commands. Selectable menu panels may be included in the interface, and may overlay displayed contents of documents being viewed and/or edited to ensure that certain menu options are always available. The menu may be given multiple distinct appearances corresponding to different display sizes.