The Artvertiser imagines a near-future where advertising in public space can be replaced by art. It is an urban, augmented-reality project, consisting of custom-made handheld binocular devices and specially designed software. The Artvertiser situates the 'read-only', proprietary imagery of our public spaces as a 'read-write' platform for the presentation of non-proprietary and critically engaging content. During the workshop, participating artists will create visual works to replace urban advertisements in Helsinki using real time computer vision techniques developed by Julian Oliver and Damian Stewart.