Nowadays when moving in public spaces such as pedestrian areas, train stations or shopping centers, people can oftentimes encounter public displays. They provide passersby with information potentially relevant to their current situation and needs, e.g. places of interest or train schedules. However, not always does a passerby find a way to tailor the information content displayed to his or her current needs. These noninteractive displays update their displayed contents, if at all, based on internal signals the passerby has no control over. Updates may occur in set intervals of time or upon a train’s arrival and departure, for example. Interactive public displays on the other hand offer passersby the option to actively manipulate the displayed contents in a way they see fit to their current needs. They can, for example, gather more information on a certain place of interest or a shopping center’s offerings. If a public display’s hardware does not inherently support interaction, for example via touch or gestures, retrospectively implementing such interaction techniques requires either all new hardware replacing the old display, or additional hardware such as cameras. Adding new hardware however proves challenging when simultaneously trying to meet the requirements posed upon public interfaces. In this work, possible ways to enable interaction for otherwise noninteractive public displays, while keeping privacy concerns in mind, will be discussed and a prototype using thermal vision is developed.