Located in a pedestrian tunnel in norway, the strømer is an interactive led wall which turns shadow into light. the installation is based on architect stig skjelvik's ‘dobpler’ prototype. as pedestrians walk by the wall, a camera captures their silhouette and displays the same shape on the wall in lights. because movement activates the wall, it remains dark until someone is sensed nearby. this illuminates the walkway for pedestrians and saves energy by turning off when unnecessary.